ICOS
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Internal Combustion Optical Sensor (ICOS) Optical Engine Indication & LaVision FOCUS ON IMAGING

In-Cylinder Optical Indication ► air/fuel ratio ► exhaust gas concentration and EGR ► gas temperature ► analysis of highly dynamic engine conditions ► crank angle and cycle resolved ► no engine modification needed ► for spark ignition and compression ignition engines Optical engine indication synchronized with standard pressure indication allows a much more detailed characterization of the in-cylinder charge formation process.

Internal Combustion LaVision’s Internal Combustion Optical Sensors (ICOS) measure Optical Sensor crank angle resolved air/fuel ratio, exhaust gas concentration and ^ gas temperature locally at the spark plug, glow plug or at any other in-cylinder location using optical probes. The ICOS systems provide highly time resolved data of the relevant engine parameters at the tip of the probe. Single cycle parameter profiles as well as variations over many cycles are recorded. Measurement Principle of Optical Engine Indication The ICOS measurement systems are based on infrared absorption...

Cycle-to-Cycle Variations crank angle [°aTDC] 3.5 fuel λ-value Abnormal combustion in individual cycles is resolved such as the delayed ignition in the marked cycle 401. The drop in the fuel density at 100 °CA aTDC marks the appearance of the flame front locally at the probe tip. The timing is significantly later than the ignition point. For this individual cycle, the fuel density and the corresponding l-value curve are also shown in the bottom diagram. The l-value curve is calculated from the fuel density using a thermodynamic model. The ICOS-Fuel system offers the possibility to examine...

Ultra-Fast In-Cylinder Gas Analysis 4air/fuel ratio - lambda value - transients 4investigation of highly dynamic engine conditions 4verification of injection strategies and systems The ignitibility quality of in-cylinder charge cannot be determined by pressure indication alone. Additional optical engine indication of fuel density and local air/fuel ratio at the spark plug position reveals a quantification of the ignitibility of the mixture at the exact ignition position. The crank angle resolved measurement of the fuel density distinguishes the ICOS-Fuel system from other techniques, like...

Variation of external EGR measured in-cylinder CO2 concentration [%] For in-cylinder CO2 measurements the ICOS probe was placed into a glow plug adapter of a Diesel engine. The diagram shows the different in-cylinder CO2-concentrations for changing applied external EGR rates. The absolute amount of CO2 in the cylinder is determined with crank angle resolution over single cycles. The correlation between the applied external EGR rate and the measured EGR rate for two different engine speeds in a truck Diesel engine is demonstrated here. The error bars show the EGR fluctuations over 100...

Ultra-Fast In-Cylinder Gas Analysis 4internal and external EGR-rates 4analysis of EGR-stability 4synchronous multi cylinder measurements Exhaust Gas Recirculation (EGR) is part of the strategy for the development of more efficient and cleaner IC-engines. The fast cycle resolved detection of the EGR-rate is essential to evaluate stable engine conditions. LaVision´s ICOS-EGR is a fast optical indication system for measuring the incylinder EGR-rate based on the detection of CO2 and water. While conventional gas sampling probes need averaging over multiple cycles, the ICOS system allows single...

Temperature during Compression temperature [K] ICOS Indicated temperature Focus on compression stroke Indicated in-cylinder gas temperature in a fired 4-stroke DISI engine is shown in the top diagram, the simultaneously recorded pressure is shown in the bottom diagram. The local gas temperature is determined at the spark plug position using a standard ICOS spark plug probe. Cross cylinder line-of-sight probes are also available to measure integral cross-cylinder temperatures. Indicated pressure Transient Temperatures during Tip-in The in-cylinder gas temperature was measured in a near...

► temperature indication during mixture formation ► effect of EGR-rate ► validation of simulation models ► supercharging, downsizing, HCCI The knowledge of the gas temperature during the mixture formation is becoming increasingly interesting for the development of combustion processes. The high demand on lowering emissions in internal combustion engines has also led to the increased employment of Exhaust Gas Recirculation (EGR). Particularly when using high internal EGR rates, the gas temperature can only be determined directly in-cylinder with a fast in-situ measurement. LaVision’s...

ICOS Sensor Probes M12 spark plug probe M12 combination probe, simultaneous fuel / EGR and temperature measurements Probe Adapters LaVision provides a variety of adapters to install our incylinder probes into your engine, for example, glow plug adapters for use in Diesel engines, as illustrated in the picture. We have experience in designing custom adapters for almost any application.

Solutions for all Types of Engines 4integrated spark plug probes 4non-firing probes for flexible choice of location 4integral line-of-sight probes 4large variety of adapters to suit different applications Firing and non-firing sensor probes are available for the ICOS systems. The in-cylinder probes can be installed in almost any engine with no modification required. This is applicable for research test engines up to near production engines with limited optical access. For example, the spark plug probe directly replaces the standard spark plug in SI engines while maintaining full firing...

ICOS-Temperature LaVision GmbH Anna-Vandenhoeck-Ring 19 D-37081 Gottingen / Germany E-Mail: info@lavision.com www.lavision.com Tel.: +49-(0)5 51-9004-0 Fax: +49-(0)551-9004-100 LaVisionUK Ltd 2 Minton Place / Victoria Road Bicester / Oxon / OX26 6QB / United Kingdom E-Mail: sales@lavisionuk.com www.lavisionUK.com Phone: +44-(0)-870-997-6532 Fax: +44-(0)-870-762-6252 LaVision Inc. 211 W. Michigan Ave. / Suite 100 Ypsilanti, MI 48197 / USA E-Mail: sales@lavisioninc.com www.lavision.com Phone: (734) 485 - 0913 Fax: (240) 465 - 4306