Abstract: 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.

Abstract: The invention relates to a method for impressing an electrical alternating signal in an electrochemical energy supply device (1) by means of a control device (2), in which method a coupling capacitor (Ck) is connected in series between the control device (2) and the energy supply device (1) during the duration of the signal impression operation comprising the following steps which are executed by the control device (2): a) outputting an output signal (Sout) corresponding to the alternating signal to be impressed, for impression into the energy supply device (1), wherein the output signal (Sout) is determined based on at least one setpoint (Sset), which is set by the control device (2), of the alternating signal to be impressed; b) detecting an actual signal (Sact) which corresponds to the output signal and which is applied to the energy supply device, c) comparing the actual signal (Sact) with the setpoint (Sset) of the alternating signal to be impressed and d) controlling the output signal (Sout) in order t

Abstract: 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.

Abstract: The invention relates to a method for impressing an electrical alternating signal in an electrochemical energy supply device (1) by means of a control device (2), in which method a coupling capacitor (Ck) is connected in series between the control device (2) and the energy supply device (1) during the duration of the signal impression operation comprising the following steps which are executed by the control device (2): a) outputting an output signal (Sout) corresponding to the alternating signal to be impressed, for impression into the energy supply device (1), wherein the output signal (Sout) is determined based on at least one setpoint (Sset), which is set by the control device (2), of the alternating signal to be impressed; b) detecting an actual signal (Sact) which corresponds to the output signal and which is applied to the energy supply device, c) comparing the actual signal (Sact) with the setpoint (Sset) of the alternating signal to be impressed and d) controlling the output signal (Sout) in order to

Abstract: For continuous measurement of the dynamic fuel consumption of an internal combustion engine with a venting tank (10) which is disposed in a return line (11) from the outflow side (12) of the fuel system (7) and is also connected to the intake line (13) to the fuel system, a filling level regulator (15) is provided at a connection of the venting tank (10) and has a circulation pump (22) as well as a control valve (9) 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.

Abstract: For continuous measurement of the dynamic fuel consumption of an internal combustion engine with a venting tank (10) which is disposed in a return line (11) from the outflow side (12) of the fuel system (7) and is also connected to the intake line (13) to the fuel system, a filling level regulator (15) is provided at a connection of the venting tank (10) and has a circulation pump (22) as well as a control valve (9) 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.

Abstract: For operating an electromechanical transducer system with at least one piezoelectric transducer element, if necessary at least one identification element and an electronic control unit, on the one hand, the wanted signals of a certain utility operating range defined by the frequency band and time window thereof, assigned to at least one piezoelectric transducer element, as well as, on the other hand, inquiry signals and response signals for the functional testing of the transducer system are transmitted via a line system with only one electrical signal line.

Abstract: 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 (6) is located in or on the sensor unit that can be polled by the analysis unit (4) and to which sensor-specific data are allocated in a storage unit (5), and a data carrier (7) 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 (4) and can be compared with the first set of sensor-specific data of storage unit (5). 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.

Abstract: To reduce the complexity of an indicating system 6 on an internal combustion engine for determining a parameter, the invention provides that on the basis of the measured variable a computing unit 8 for the indicating system 6 computes crank angle information, and on the basis of the crank angle information thus computed and the measured variable determines an engine parameter.

Abstract: 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.

Abstract: To reduce the complexity of an indicating system 6 on an internal combustion engine for determining a parameter, the invention provides that on the basis of the measured variable a computing unit 8 for the indicating system 6 computes crank angle information, and on the basis of the crank angle information thus computed and the measured variable determines an engine parameter.

Abstract: 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, it is proposed to locate, in or on the sensor unit (1) a sensor identification (6) that can be polled by the analysis unit (4) and to which sensor-specific data are allocated in a storage unit (5), and in or on the sensor unit (1) a data carrier (7) is located on which a second set of sensor-specific data are stored that can be read by the analysis unit (4) and can be compared with the first set of sensor-specific data of storage unit (5). 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.

Abstract: 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 (10) 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.

Abstract: 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.

Abstract: A measuring and testing system for a test piece (1) 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 (2) of the test piece (1) containing operational fluid, and comprising a partial measuring arrangement (4, 5, 6) for the quantity parameter of the operational fluid and at least one additional partial measuring arrangement (6, 7) 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 (6) connected to the measuring arrangement.

Abstract: A measuring arrangement including a sensor (1), an interpretation unit (3) connected to said sensor via a detachable connection cable (2), and a memory module (4) having sensor-relevant data whereby the memory module is assigned to the sensor and may be interrogated by the interpretation unit to simplify deference of the sensor-relevant data in the interpretation unit (3) following a possible exchange of sensors. The memory module (4) is arranged outside of the sensor (1) so that the arrangement can also be employed in a rough environment whereby there is provided on the sensor (1) itself an identification unit (5) having a sensor identification ability that may be correlated with the memory module (4).

Abstract: 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 (7, 8, 9, 10) 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 (5, 6) 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.

Abstract: 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.

Abstract: A measuring and testing system for a test piece (1) 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 (2) of the test piece (1) containing operational fluid, and comprising a partial measuring arrangement (4, 5, 6) for the quantity parameter of the operational fluid and at least one additional partial measuring arrangement (6, 7) 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 (6) connected to the measuring arrangement.

Abstract: 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.