Avl North America, Inc.

Avl Emission Test Systems Gmbh

Norbert Kreft

William Martin Silvis

Gerald Marek

Wolfgang Schindler

James Patrick Williamson

Christopher Garthe

Achim Dickow

Sascha Willich

Joseph McDonald

Torsten Bornemann

Dirk Woiki

Geraki Marek

A condensate separator for an exhaust gas measuring system. The condensate separator includes a housing with condensate discharge opening, an inlet opening arranged in the housing, a cooled inlet line which introduces a fluid into the housing, and a gas outlet port with a gas entrance and a gas exit. The cooled inlet line opens into the inlet opening. The gas outlet port opens into a gas outlet line. A cross-sectional area of the gas entrance of the gas outlet port is larger than a cross-sectional area of the gas exit of the gas outlet port.

Condensate separator for exhaust gas measuring systems

A switch cabinet for an exhaust-gas measurement installation includes a cabinet body with two side walls, a ceiling, a floor, a front side and a back wall, a door to close the front side, a measurement gas distributor arranged in the cabinet body with an outlet, a coupling element fastened to the measurement gas distributor to form the outlet, at least one measuring device arranged in the cabinet body with an inlet, and a coupling element fastened to the at least one measuring device to form the inlet. The inlet is connected to the outlet to provide a gas-tight connection. The measurement gas distributor moves relative to the cabinet body so that the coupling element fastened to the measurement gas distributor and forming the outlet can be connected by insertion to the coupling element fastened to the at least one measuring device and forming the inlet.

Switch cabinet for exhaust-gas measurement installations

An exhaust-gas sampling system includes a main conveying line, a main throughput pump which conveys a sample gas in the main conveying line, a sample gas bag, a sample gas withdrawal line which fluidically connects the main conveying line to the sample gas bag, a throughflow control element arranged in the sample gas withdrawal line, an analyzer, a sample gas analysis line which connects the analyzer to the sample gas bag, an evacuation line which establishes a fluidic connection between the main throughput pump and the sample gas bag, and a first valve arranged in the evacuation line. The first valve opens and closes the evacuation line.

Exhaust-gas sampling system, and method for operating an exhaust-gas sampling system of said type

A device for determining a concentration of at least one gas in a sample gas stream includes an analysis chamber, a detector, and a connecting channel. The analysis chamber is configured to have the sample gas stream and a reaction gas stream be introduced therein. The sample gas stream and the reaction gas stream are mixed to a gas mixture which reacts so as to emit an optical radiation. The detector is configured to measure the optical radiation. The connecting channel is configured to connect the analysis chamber to the detector. The connecting channel is configured as a light conductor extending from the analysis chamber to the detector.

Device for determining the concentration of at least one gas in a sample gas stream

An exhaust emission analysis system is provided that includes an exhaust and dilution gas source respectively providing exhaust and dilution gases. A dilution unit includes exhaust and dilution gas mass flow controllers, fluidly connected to the exhaust and dilution gas sources. The mass flow controllers define a gas flow rate of gas from their respective gas source. A connection mixes the gases to provide a diluted exhaust gas having an incorrect dilution ratio. A water measurement device measures the water content of the exhaust gas. A water content dilution signal is sent from the water measurement device to a control device. An adjustment factor is calculated by the controller and a flow rate command signal is sent from the controller, to the exhaust gas mass flow controller to adjust the gas flow rate of the exhaust gas and provide a corrected dilution ratio at the connection.

Engine exhaust emissions measurement correction

A perforated mixing plate and is fluid passage are used in conjunction with a dilution tunnel to prevent particulate matter from collecting on the sampling system components. An inlet of a sampling probe is offset from the centerline of the dilution tunnel to a location corresponding to an average particulate matter concentration along a flow profile of a sample mixture to reduce the length of the dilution tunnel.

Particulate deposit avoidance and probe positioning

An exhaust flow measurement system uses a noise attenuation device to cancel exhaust gas pulsations at the harmonic frequency of a flow rate measurement transducer.

Anti-aliasing acoustic filter in the presence of pulsating flow

An emission sampling system includes an exhaust gas probe for sampling exhaust gas. A dilution gas source provides a dilution gas, and a mixing device is in fluid communication with the exhaust gas probe and the dilution gas source to mix the sampled exhaust gas and the dilution gas to form a diluted exhaust gas. A particulate filter is in fluid communication with the mixing device downstream therefrom. A dilution temperature conditioning device is arranged between the dilution gas source and the mixing device for obtaining a desired dilution gas temperature. A temperature sensor is arranged in the sampling system for producing a temperature signal corresponding to a temperature of fluid flowing through the sampling system. A controller is connected to the temperature sensor for processing the temperature signal and determining a filter temperature from the temperature signal. The controller commands the conditioning device in response to the filter temperature.

Active filter temperature control

A vehicle exhaust measurement system is provided includes that a conduit having a conduit inlet and a conduit outlet. A make-up air tube is connected to and is in fluid communication with the conduit inlet. The make-up air tube provides make-up air for mixing an exhaust gas. A mixed gas tube is connected to and is in fluid communication with the conduit outlet. The mixed gas tube conveys a mixture of make-up air and exhaust gas to analysis equipment. In the preferred embodiment, the exhaust gas tube extends through an outer wall of the conduit. A mixing plate is arranged in either the conduit or the mixed gas tube with the exhaust gas tube extending to a position adjacent to the mixing plate. The exhaust gas tube conveys the exhaust gas to the mixing plate to mix the exhaust gas and the make-up air at the mixing plate. A correction factor may be applied to the measurements taken by a differential pressure based fluid flow measurement device such as a smooth approach orifice (SAO) to provide an adjusted flow of measurement at the flow measurement device to correct for the pressure pulsations. The correction factor is calculated based upon the intensity of the pulsations of the differential pressure signal, which indicates the flow through the SAO.

Exhaust volume measurement device

An exhaust gas measurement system is provided that includes a probe to find a sample exhaust gas passageway for collecting exhaust gas. A stainless steel canister is fluidly connected to the probe for storing the exhaust gas. A pump fluidly interconnects the probe and the canister for transferring the exhaust gas from the probe to the canister. A pressure mass flow controller fluidly interconnects the probe and the canister and produces an exhaust gas flow measurement corresponding to the flow of the exhaust gas from the probe to the canister. A temperature sensor senses a temperature of the exhaust gas proximate to the pressure mass flow controller. The temperature sensor corrects the exhaust gas flow measurement based upon the temperature sensed. A pressure sensor senses a pressure of the exhaust gas proximate to the pressure mass flow controller. The temperature sensor corrects the exhaust gas flow measurement based upon the pressure sensed. The mass flow controller can be controlled by an external source to account for flow changes in the CVS system. A heating device heats the stainless steel canister and other components of the exhaust gas measurement system such as the pressure mass flow controller to a temperature of preferably approximately 191&#xb0; C. Another heated pressure mass flow controller may also be used to determine the amount of exhaust gas that is transferred from the canister to an analyzer for the actual determination of the hydrocarbons.

Heated stainless steel emissions canister

A particulate sampler is provided for use in analyzing particulate matter in exhaust gas. The sampler includes a transfer tube assembly including a probe at least partially defining a sample exhaust gas passageway. The transfer tube assembly has a first end portion with an opening for receiving exhaust gas and extends to a second end portion. A mixer receives the second end portion and includes a dilution gas passageway for carrying a dilution gas. The dilution gas passageway is in communication with the sample exhaust gas passageway for introducing the dilution gas to the exhaust gas. A tunnel is connected to the mixer and includes a gas mixing passageway extending a length for homogeneously mixing the gases together. The gas mixing passageway tapers toward the second end portion to ensure that the particulate matter mixes with the gases along the length of the gas mixing passageway without collecting in a recirculating flow area. The transfer tube includes an insulator cavity to insulate the sampler exhaust gas passageway and maintain the temperature of the exhaust gases within. Insulation may be arranged in the insulated cavity or exhaust gas may be conveyed through the insulator cavity to insulate the sample exhaust gas passageway.

Particulate sampling probe and dilution tunnel

A particulate sampler is provided for conveying exhaust gas from exhaust gas source to analysis equipment. The particulate sampler includes a probe for receiving the exhaust gas and a transfer tube for conveying the exhaust gas from a tailpipe to a mixer. The mixer mixes the exhaust gas and a dilution gas from a dilution source. A dilution tunnel mixes and conveys the exhaust gas and dilution gas from the mixer to analysis equipment such as a filter or gas analyzers. A flow pulsation cancellation device includes an actuator in communication with at least one of the tailpipe, probe, transfer tube, mixer, and dilution tunnel for introducing a canceling pressure pulse to minimize the effects of pressures pulses present from the tailpipe within the sampler. The actuator may be a moveable membrane or a fluid flow control valve. Pressure sensors are used to measure the pressure of the undiluted and diluted exhaust gas, and a controller determines the desired canceling pressure pulse based upon the measured pressures.

Active pulsation cancellation device for diesel particulate sampling systems

An exhaust emission analysis system is provided that includes an exhaust and dilution gas source respectively providing exhaust and dilution gases. A dilution unit includes exhaust and dilution gas flow devices, such as mass flow controllers, fluidly connected to the exhaust and dilution gas sources, respectively. The metering device in the mass flow controllers defines a gas flow rate of gas from its respective gas source. The gas flow devices are fluidly connected at a connection that mixes the gases to provide a diluted exhaust gas having an incorrect dilution ratio. A water measurement device such as an analyzer measures the water content of the exhaust gas, preferably subsequent to dilution. A water content dilution signal corresponding to the water content in the exhaust gas is sent from the water measurement device to a control device. An adjustment factor is calculated by the controller and a flow rate command signal is sent from the controller corresponding to the adjustment factor, preferably, to the exhaust gas mass flow controller to adjust the gas flow rate of the exhaust gas and provide a corrected dilution ratio at the connection. Correction of the diluted exhaust gas ratio may also be provided to particulate samplers according to the above principles.

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Meerbusch, Germany

Norbert Kreft