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DE4236943A1 - Leak detector for gas suction line for exhaust gas concentration measurement - has flow resistance and flow sensor in series, and compares stored and current flow values - Google Patents

Leak detector for gas suction line for exhaust gas concentration measurement - has flow resistance and flow sensor in series, and compares stored and current flow values

Info

Publication number
DE4236943A1
DE4236943A1 DE19924236943 DE4236943A DE4236943A1 DE 4236943 A1 DE4236943 A1 DE 4236943A1 DE 19924236943 DE19924236943 DE 19924236943 DE 4236943 A DE4236943 A DE 4236943A DE 4236943 A1 DE4236943 A1 DE 4236943A1
Authority
DE
Germany
Prior art keywords
flow
suction line
leak detector
series
gas concentration
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.)
Withdrawn
Application number
DE19924236943
Other languages
German (de)
Inventor
Wolfgang Dipl Ing Merkel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 by Individual filed Critical Individual
Priority to DE19924236943 priority Critical patent/DE4236943A1/en
Publication of DE4236943A1 publication Critical patent/DE4236943A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
    • G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

A flow resistance (2) is installed at the input of the gas suction line (1) and a flow sensor (3) is installed behind this in the suction line. Each instantaneous flow value is stored for a defined time and the stored value compared with the current flow value. The comparison result is signalled by a comparator. USE/ADVANTAGE - For measurement of gas concentration in vehicle exhaust gases. Overcomes problem of measurement errors caused by ambient air being drawn in via leak in induction system is overcome.

Description

Die Erfindung betrifft ein Leckdetektor für Gasansaugleitungen, bestehend aus einem Strömungswiderstand am Eingang und einem Durchflußsensor in der Gasansaugleitung. Bei der Messung von Gaskonzentrationen in Kraftfahrzeugabgasen tritt das Problem auf, daß die Gaskonzentration falsch gemessen wird, wenn durch ein Leck im Ansaugschlauch Nebenluft gezogen wird. Weiterhin können Benzoldampfabsaugleitungen an Tankstellen leck werden. Es ist sinnvoll anzuzeigen, daß dann gesundheitsschädliche Gase austreten. In der erfindungsgemäß gelösten Aufgabe signalisiert ein Durchflußsensor erhöhten Durchfluß, hervorgerufen durch ein vom Leck in der Ansaugleitung vermin­ derten Strömungswiderstand der Ansaugleitung. Befindet sich in der Ansaugleitung ein Filter, daß sich durch Partikel zusetzt oder sinkt die Pumpenleistung für den Ansaugvorgang, sinkt auch der Durchfluß, entweder durch erhöhten Strömungswiderstand oder durch verminderte Förderleistung der Pumpe. Erfindungsgemäß wird der momentane Durchflußwert für eine bestimmte Zeit gespeichert und mit dem aktuellen Durchfluß verglichen. Das Ergebnis wird durch einen Komparator signalisiert. Bei erhöhtem Durchfluß durch ein plötzlich auftretendes Leck in der Ansaugleitung, kann dieses angezeigt werden. Auch bei schleichender Abnahme der Pumpenleistung oder schleichende Erhöhung des Strömungswiderstandes der Ansaugleitung durch Zusetzen des Filters durch Partikel, wird ein Leck angezeigt.The invention relates to a leak detector for Gas intake pipes, consisting of a flow resistance at the entrance and a flow sensor in the gas intake line. When measuring gas concentrations in Motor vehicle exhaust gas has the problem that the Gas concentration is measured incorrectly if there is a leak in the Intake hose secondary air is drawn. Can continue Benzene vapor extraction lines at gas stations are leaking. It is sensible to indicate that then harmful gases emerge. In the problem solved according to the invention a flow sensor signals increased flow, caused by a leak from the suction line Lower flow resistance of the intake line. Is located a filter in the intake line that is separated by particles closes or decreases the pump capacity for the Suction process, the flow rate also drops, either through increased flow resistance or due to reduced Pump output. According to the present Flow value stored for a certain time and with the current flow compared. The result is shown by a Comparator signals. With increased flow through a Suddenly occurring leak in the intake line, this can are displayed. Even with gradual decrease in Pump performance or gradual increase in Flow resistance of the intake line by clogging of the filter due to particles, a leak is indicated.

Wird die Spannung der Referenzspannungsquelle (6) negativ und die Spannung des Durchflußsensors (3) positiv gemacht, so wird bei sinkendem Durchfluß stets der Minimalwert des Durchflusses gespeichert. Bei steigendem Durchfluß, infolge eines Lecks, wird dies durch den Komparator (8) signalisiert. If the voltage of the reference voltage source ( 6 ) is negative and the voltage of the flow sensor ( 3 ) is made positive, the minimum value of the flow is always saved when the flow decreases. When the flow increases due to a leak, this is signaled by the comparator ( 8 ).

Fig. 1 zeigt die Anordnung der Leckdetektoreinrichtung mit der Pumpe (5), Filter (4), Gasansaugleitung (1) Strömungswiderstand (2) und Durchflußsensor (3). Fig. 1 shows the arrangement of the leak detector device with the pump ( 5 ), filter ( 4 ), gas suction line ( 1 ) flow resistance ( 2 ) and flow sensor ( 3 ).

Fig. 2 zeigt eine analoge Leckdetektorschaltung bestehend aus Referenzspannungsquelle (6), Durchflußsensor (3), Minimalwertspeicher (7), Komparator (8) und Verstärker (9). Fig. 2 shows an analog leak detector circuit consisting of reference voltage source ( 6 ), flow sensor ( 3 ), minimum value memory ( 7 ), comparator ( 8 ) and amplifier ( 9 ).

Claims (2)

1. Leckdetektor für Gasansaugleitungen, dadurch gekennzeichnet, daß am Eingang der Gasansaugleitung (1) ein Strömungswiderstand (2) installiert ist und hinter diesem, in der Ansaugleitung (1), ein Durchflußsensor (3) installiert ist.1. A leak detector for Gasansaugleitungen, characterized in that at the entrance of the gas intake pipe (1) a flow resistance (2) is installed, and is installed behind this in the intake passage (1), a flow sensor (3). 2. Leckdetektor nach Anspruch 1, dadurch gekennzeichnet, daß der jeweilige momentane Durchflußwert für eine bestimmte Zeit gespeichert wird und der gespeicherte Wert mit dem aktuellen Durchflußwert verglichen und das Ergebnis durch einen Komparator signalisiert wird.2. Leak detector according to claim 1, characterized in that the respective current flow value for a certain time is saved and the saved value with the current Flow value compared and the result by a Comparator is signaled.
DE19924236943 1992-11-02 1992-11-02 Leak detector for gas suction line for exhaust gas concentration measurement - has flow resistance and flow sensor in series, and compares stored and current flow values Withdrawn DE4236943A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19924236943 DE4236943A1 (en) 1992-11-02 1992-11-02 Leak detector for gas suction line for exhaust gas concentration measurement - has flow resistance and flow sensor in series, and compares stored and current flow values

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19924236943 DE4236943A1 (en) 1992-11-02 1992-11-02 Leak detector for gas suction line for exhaust gas concentration measurement - has flow resistance and flow sensor in series, and compares stored and current flow values

Publications (1)

Publication Number Publication Date
DE4236943A1 true DE4236943A1 (en) 1993-05-19

Family

ID=6471897

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19924236943 Withdrawn DE4236943A1 (en) 1992-11-02 1992-11-02 Leak detector for gas suction line for exhaust gas concentration measurement - has flow resistance and flow sensor in series, and compares stored and current flow values

Country Status (1)

Country Link
DE (1) DE4236943A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0674165A2 (en) * 1994-03-25 1995-09-27 GRUNDIG E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig GmbH & Co. KG Procedure for leak testing exhaust gas measuring apparatus and measuring probes connected therewith

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1573746A1 (en) * 1964-11-16 1970-04-16 Puregas Equipment Corp Method and device for determining a leak in a system through which a flow device flows
DE2946654A1 (en) * 1979-11-19 1981-05-27 Günther 7070 Schwäbisch Gmünd Mölling LEAKAGE MEASURING DEVICE FOR GASES
DE3918294A1 (en) * 1988-06-08 1989-12-14 Sarlin Ab Oy E METHOD AND DEVICE FOR MONITORING A WASTEWATER PUMP STATION
GB2236396A (en) * 1989-09-30 1991-04-03 Spectrascan Limited Data logging equipment for detecting leakage from a water main

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1573746A1 (en) * 1964-11-16 1970-04-16 Puregas Equipment Corp Method and device for determining a leak in a system through which a flow device flows
DE2946654A1 (en) * 1979-11-19 1981-05-27 Günther 7070 Schwäbisch Gmünd Mölling LEAKAGE MEASURING DEVICE FOR GASES
DE3918294A1 (en) * 1988-06-08 1989-12-14 Sarlin Ab Oy E METHOD AND DEVICE FOR MONITORING A WASTEWATER PUMP STATION
GB2236396A (en) * 1989-09-30 1991-04-03 Spectrascan Limited Data logging equipment for detecting leakage from a water main

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
4- 6416 A., P-1338, Apr.16, 1992,Vol.16, No.155 *
JP Patents Abstracts of Japan: 4-113227 A., P-1397, Aug. 6, 1992,Vol.16, No.365 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0674165A2 (en) * 1994-03-25 1995-09-27 GRUNDIG E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig GmbH & Co. KG Procedure for leak testing exhaust gas measuring apparatus and measuring probes connected therewith
EP0674165A3 (en) * 1994-03-25 1996-08-07 Grundig Emv Procedure for leak testing exhaust gas measuring apparatus and measuring probes connected therewith.

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Legal Events

Date Code Title Description
OAV Applicant agreed to the publication of the unexamined application as to paragraph 31 lit. 2 z1
OR8 Request for search as to paragraph 43 lit. 1 sentence 1 patent law
8122 Nonbinding interest in granting licenses declared
8105 Search report available
8139 Disposal/non-payment of the annual fee