Avl List Gmbh

Avl Gesellschaft Fur Verbrennungskraftmaschinen Und Messtechnik M.b.h.

Other

Klaus-Christoph Harms

Josef Glaser

Rüdiger Teichmann

Martin Rzehorska

Peter W Krempl

Wolfgang Schindler

Michael Wiesinger

Paul Kirschbaum

Helmut List

Franz Knopf

Gunter Engel

Karl Wojik

Christian Beidl

Klaus Leitmeier

Wolfgang Kling

Rudolf Christian

Friedrich Ruckenbauer

Johann Eitzinger

Harald Grantner

Mario Kupnik

Norbert Mayrhofer

Franz Graf

Josef Moik

Georg Abler

Michael Rasser

Jerome Gruaz

Joseph Moik

Herbert Reingruber

Gernot Fernitz

Josef Reiterer

Anton Rosenkranz

Karol Schleifer

Ernst Fuchs

Tristan Reinisch

Andreas Schröder

Dieter Chybin

Aspects of the present disclosure are directed to a measuring device for determining a measured variable of a measuring gas by means of a photoacoustic method. In some embodiments, the measuring device includes a flow channel for the measuring gas having at least one feed line, a photoacoustic measuring cell and a discharge line. in such an embodiment, the measuring device further includes at least one acoustic filter member tuned to a useful frequency of the measuring cell, and at least one cavity resonator arranged on the flow channel.

Measuring device for ascertaining a measurand of a measurement gas

The invention relates to a method for impressing an electrical alternating signal in an electrochemical energy supply device () by means of a control device (), in which method a coupling capacitor (C) is connected in series between the control device () and the energy supply device () during the duration of the signal impression operation comprising the following steps which are executed by the control device ():

Circuit arrangement for impressing an electrical signal into an electrochemical energy supply device

For continuous measurement of the dynamic fuel consumption of an internal combustion engine with a venting tank () which is disposed in a return line () from the outflow side () of the fuel system () and is also connected to the intake line () to the fuel system, a filling level regulator () is provided at a connection of the venting tank () and has a circulation pump () as well as a control valve () connected thereto, through which the flow passes continuously, and which is opened more or less as a function of the filling level to be regulated. Thus apparent consumptions occurring in specific operating states of the internal combustion engine can be avoided but can also be taken into account as corrections.

Device and method for continuous measurement of the dynamic fuel consumption of an internal combustion engine

In order to make error recognition, for example, in cabling, in the stored data or in the data allocation, in the allocation of a sensor unit to sensor-relevant data for calibration of an analysis unit that is connected with a sensor unit possible, a sensor identification () is located in or on the sensor unit that can be polled by the analysis unit () and to which sensor-specific data are allocated in a storage unit (), and a data carrier () is located in or on the sensor unit in which a second set of sensor-specific data are stored that can be read by the analysis unit () and can be compared with the first set of sensor-specific data of storage unit (). Upon agreement of the first and second set of sensor-specific data, the measuring signals are transformed into measurement data by considering the sensor-specific data.

Test assembly and procedure for capturing performance data

To reduce the complexity of an indicating systemon an internal combustion engine for determining a parameter, the invention provides that on the basis of the measured variable a computing unitfor the indicating systemcomputes crank angle information, and on the basis of the crank angle information thus computed and the measured variable determines an engine parameter.

Indicating system and method for determining an engine parameter

The life of a sensor unit is very strongly dependent on the loading of the sensor unit during use. The life of a sensor unit is generally specified in a number of loading cycles, however, which does not take into consideration the loading of the sensor unit. The invention therefore specifies a method and apparatus for assessing the residual life of a sensor unit which takes into consideration the actual loading of the sensor unit and therefore the residual life of the sensor unit can be estimated more precisely by virtue of a damage factor (S) being determined for the loading of a loading cycle (B) and the loading cycle (B) being weighted therewith.

Method and apparatus for assessing the residual life of a sensor unit

A measuring and testing system for a test piece () with at least one operational fluid, particularly to test an internal combustion engine, is provided with at least one measuring arrangement connected to a space () of the test piece () containing operational fluid, and comprising a partial measuring arrangement () for the quantity parameter of the operational fluid and at least one additional partial measuring arrangement () for at least one quality parameter for the characterization of the physical and/or chemical condition of the operational fluid, as well as a control and evaluation unit () connected to the measuring arrangement. An evaluation logic is implemented in the evaluation unit () whereby said evaluation logic links the quantity parameters with at least one condition parameter according to a predefinable relationship and determines the usability potential of the operational fluid to be able to give in a systematic and simple manner also information about the admissibility and possible validity of the parameters of the operational fluids and possibly about other measuring and testing results.

Measuring arrangement and method to determine at intervals the usability potential of at least one operational fluid in an engine

A measuring chamber for photo-acoustical sensors for the continuous measurement of radiation-absorbing substances, in particular of radiation-absorbing particles, in gaseous samples includes at least one entry and at least one exit for the samples, a tube section with microphone that allows for the flow-through of the sample in longitudinal direction, and at least one entry and exit point for a laser beam that is aligned with the tube section, and whereby these entry and exit points are both arranged at a distance from the measuring tube by at least one chamber with a cross-sectional area that is expanded relative to the tube section. To prevent soiling of the windows at the points of entry of the radiation into the cell and to slow down the deposition of the particles of the measured aerosol, whereby long-term, high-sensitivity operation of the measuring cell is possible, two entries () are envisioned at two ends of the tube section () that are opposite relative to each other and at least one exit () that is arranged at a location which is centered between the entries ().

Measuring chamber for photo-acoustical sensors

An ultrasonic gas flowmeter includes a measuring pipe with flowing gas, transmitting and receiving sound transducers, transmission and reception electronics, and evaluation electronics. The sound transducers () are designed as capacitive electro-acoustic ultrasonic transducers to construct a flowmeter with improved capacity, especially in view of temperature stability and the reduction and consideration of a temperature profile. Devices () are provided to level the gas temperature profile and to minimize the influence of the temperature profile on the flow measurement. A more accurate and dependable detection of the volume flow or the mass flow of gases is to be achieved, especially in highly dynamic flows, for the method of determining the flow of gases whereby the mean flow velocity is determined and the flowing gas quantity is determined with highly synchronized resolution from the two transit times of two acoustic signals. In addition, an assessed value is computed () for the flow after the determination of the transit times and the assessed value is corrected at least by means of a characteristic temperature of the gas and the temperature of the wall of the measuring pipe ().

Ultrasonic gas flowmeter as well as device to measure exhaust flows of internal combustion engines and method to determine flow of gases

In a method for the analysis and evaluation of measured values of an open test system, a test piece is monitored during a test run by at least one signal channel which sends a signal to an evaluation unit for further processing whereby at least one plausibility node is coupled with at least one signal channel. In order to allow a statement to be made about the value of plausibility nodes and their results in relation to a specific measuring task, an evaluated plausibility is ascertained for at least one of the measured values from the type and number of plausibility nodes as well as their possible, variable interconnection. In order to permit, in addition, statements on the reliability of the results of the test system in relation to the desired measured values, it is provided that from the type and number of available plausibility nodes in combination with the type and number of available signal channels, a value is ascertained for the confidence level of the plausibility of at least one of the measured values of the current test system.

Method for the analysis and evaluation of measured values of an open test system

The invention relates to a system for the conduction of liquid media, for example fuels, between a tank and a delivery point, especially fuel consumption measuring systems or fuel conditioning systems, which includes a bubble-separating arrangement, as well as a filter element for use in such a system. For the simple and effective detection and separation of bubbles and further contaminations of every type in the particular liquid medium and, if necessary, the further development for additional simple and rapid determination of their volumes and therewith consideration in possible measurements, it is provided that the bubble-separating arrangement is formed by a filtering device and in the filtering device the connection for the liquid medium is arranged in a zone outside the filtering element.

System for the conduction of liquid media, as well as filtering device for use in such a system

A reciprocating machine with a friction bearing crank mechanism having a monitoring device monitoring operating parameters of the friction bearings of the crank mechanism via at least one sensor which is in connection with an evaluation device. At least one sensor is disposed near a part of the crank mechanism which moves in operation relative to the machine's housing. The connection of the sensor with the evaluation device is guided at least in part via the crankshaft. This provides a simple and effective monitoring option for the friction bearings of the crank mechanism and for other machine-specific parameters.

Reciprocating machine with operating parameter sensor

A sensor used especially for the measurement of the internal pressure of injection lines of diesel engines comprises two housing parts which are connected via an articulation and can be clamped to the line with a tension device. For simple and in particular one-handed attachment of the sensor in every state of opening or closing, the tension device is located in the same sector, facing the articulation, on one side of the external region of the tube. The connecting plug for the discharging of the measuring signals is preferably insertible in the correspondingly fashioned articulation and can be locked there.

Sensor for measuring the internal pressure of hollow bodies

A sensor is provided that can be used for measuring the internal pressure of injection lines of diesel engines includes two housing parts that are connected via a joint and can be clamped to the injection line using a clamping device. At least one electrical measuring element is pressed, in essentially uniform elastic fashion, onto the surface of the hollow body to be measured. The sensor also includes a support element that operates essentially in radial fashion. A protective film is arranged between the surface and the measuring element. The protective film has a thickness greater than or equal to the radial dimension of foreign bodies or the like that are to be expected on the surface of the hollow body to be measured. The protective film consists of plastic with a low modulus of elasticity. In this way, impurities, burrs and the like on the tube can easily be 'embedded' in the protective film, which, as a result of the low elasticity modulus, nonetheless still ensures a sufficiently good transmission to the measuring element of the surface expansions actually to be measured.

Sensor for measuring surface expansion of a hollow body with film

For largely automatic determination of the moment of inertia of, in particular, an internal combustion engine on a testing stand, speed n and indicated torque M.sub.M are measured under controlled operating conditions in both a run-up phase as well as in a coasting phase. In order to eliminate the loss moment in the determination of the moment of inertia, the measuring points of the respectively same speed from the run-up phase and the coasting phase are interpreted in combination, this enabling an exact determination of the moment of inertia in a very simple way with the devices that are usually already present at a testing stand.

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Thal/Graz, Austria

Klaus-Christoph Harms