DE8531960U1 - Device for testing the effectiveness of exhaust gas sensors - Google Patents

Description

The functionality of such sensors must be checked at regular intervals, whereby the problem arises, Artificially creating an exhaust gas congestion in the exhaust system at times in order to trigger the sensor. Insbe = In particular, this encounters considerable difficulties with permanently installed exhaust gas ducts.

The object of the invention is to solve this problem and to create a way of reducing the exhaust gas routing

<to block arbitrarily limited or their flow = to narrow cross-section, thereby causing the sensor to emit a pulse.

According to the invention this problem is solved in that the device enters through an opening in the wall of the exhaust gas duct in its flow path behind the sensor has insertable organ, which is effected by an actuation taking place from the outside of this guide temporarily in a narrowing its flow cross-section or locking state is relocatable.

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An easily accessible opening of small diameter suitable for introducing the organ can be made in the wall

the exhaust system can be made comparatively easily or ζ \

is already used as a measuring opening for exhaust gas loss measurement |

1 available. |

For the training of the organ, within the framework of the \

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This organ can be made from a balloon which can be filled with a fluid medium and optionally consists of an expandable material and one serving to hold it tightly and to fill or empty it, together with the balloon the wall opening insertable tubes or the like. exist, with which the balloon from a flaccid state into an at least narrowing the flow cross-section of the exhaust gas duct,

voluminous state is relocatable. j?

According to another variant, the organ can consist of a foldable fi or expandable structure consisting of a rod-shaped State in which it can be introduced into the exhaust gas duct together with its holder through the wall opening, by means of this holder can be mechanically unfolded or off = into a state that narrows or blocks the flow cross-section is spreadable.

Such design variants are illustrated by way of example in the drawings, with

Fig.l and 2 the first-mentioned variant in longitudinal sections, 3 and 4 the second-mentioned variant in

. Cross-sections through the exhaust system and in ver = |

represent different states of the organ. §

According to FIGS. 1 and 2, the organ consists of the invention Device from one through the opening 1 of the wall of an exhaust gas duct 3 in the flow path behind one "Not shown - sensor insertable balloon 4, for its sealing holder 5 and for filling a tube 6 serves that - in the unfilled state according to Fig.l with the balloon 4 together in the flow path of the exhaust gas duct

3 can be introduced and with which the balloon is then filled up to a volume which at least narrows the flow path can be. The balloon can be via the same tube 6

4 emptied after the sensor to be tested has responded and together with the tube from the exhaust gas duct be pulled out.

According to the variant shown in FIGS. 3 and 4, the organ of the device consists of a foldable one or expandable structure 7, e.g. a fan or the like. that from a rod-shaped state according to Figure 3, in which it can be introduced together with its holder 8 through the wall opening 1 into the flow path of the exhaust gas duct 3 and by means of this holder mechanically into a flow cross-section that narrows or blocks it State according to Figure 4 can be folded out or spread out.

Claims (6)

Il III · I I II ·, Joh,: Υα * Πant GmBH u. Co. November 6, 1985 4 GM 528 • Claims: 1. Device for testing the effectiveness of exhaust gas sensors built into exhaust gas ducts, marked through an opening (1) in the guide wall (2) in the flow path of the exhaust gas behind the sensor insertable organ, which is through one of the outside of this guide (3) actuation taking place temporarily in a state that narrows or blocks the flow cross-section is relocatable. 2. Device according to claim 1, characterized in that the organ from a fillable with fluid medium, optionally made of an expandable material balloon (4) and one for its sealing holder (5) and for its filling or emptying, with the Balloi. (4) together in the flow path dnr exhaust gas duct insertable tubes (6) or the like. consists with which the balloon (4) is made a flaccid state (Fig.l) by filling with a fluid medium can be displaced into a voluminous state that at least narrows the flow path. 3. Device according to claim], characterized in that that the organ on a foldable or expandable structure (7) consists of a rod-shaped state (Fig. 3), ] in which it together with its holder (8) through the wall opening (1) into the flow path of the exhaust gas duct (3) can be introduced mechanically by means of this holder (8) § in a state that at least narrows this flow path (Fig.4) can be folded out or spread out.