Indicating Amplifiers - Indicating Amplifiers - Combustion Measurement

Measure & Control
Indicating Amplifiers
AVL Approach
Our indicating amplifiers portfolio is suitable for most application fields and test environments. The different form factors of the FI/FlexIFEM and MicroIFEM amplifier families cover stand-alone usage as well as full integration into the test facility.
Benefits at a Glance
- Quick sensor swap and best traceability due to AVL Sensor Data Management SDMTM
- Easy integration in various environments due to robustness and signal filtering
- Compatibility with a large range of sensor types
- High transient accuracy due to intelligent drift compensation for piezoelectric sensors
- User-friendly parameterization due to full integration in IndiCom
Technical Data
Indicating amplifiers and signal conditioning
Product Family |
MicroIFEM |
FI |
FlexIFEM |
Number of channels |
2 or 4 |
1 or 2 |
1 or 2 |
Power supply |
9.5…36 VDC |
9.5…36 VDC |
9.5…36 VDC |
Dimensions WxHxD |
4.75'' or 9.5'' x 1HU x 230 mm |
86x112x270 mm |
86x112x270 mm |
Weight |
0.75 or 1.5 kg |
1.6 kg |
1.6 kg |
Signal output |
-11…+11 V |
-11…+11 V |
-11…+11 V |
Parameterization |
Remote via RS232 interface |
Via front-keypad, or remote via RS232 or USB interface |
Via front-keypad, or remote via RS232 or USB interface |
Integrated LCD |
no |
yes |
yes |
Sensor Data Management |
SID & SDC |
SID(*) & SDC |
SID(*) & SDC |
Peak firing pressure measurement |
yes (optional, only for MicroIFEM 2P5) |
yes (optional) |
yes (optional) |
Additional time-based measurements |
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AVL Products
Indicating amplifiers
The AVL indicating amplifiers close the gap perfectly between our sensor solutions and our data acquisition units. Our amplifiers indeed offer full compatibility with our sensors, especially via our Sensor Data Management SDMTM concept. The integration of our amplifiers in the indicating chain – especially in terms of parameterization and user-friendliness - is guaranteed by the software solution IndiCom.
Our amplifiers also offer complete stand-alone solutions in terms of basic combustion analysis, and their flexibility furthermore allows integration into a broad variety of testing environments.
Product Family |
Description |
Applications |
Products |
MICROIFEM
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Well-proven, modular and advanced amplifier concept, best suited for applications directly at the test bed and in vehicle |
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FI
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Stand-alone and intelligent amplifier concept, furthermore delivering basic combustion characteristics such as peak firing pressure |
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FLEXIFEM
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High-end scalable amplifier family with increased processor performance for complex cylinder pressure-based computations such as combustion noise or knock peaks, upwards compatible to FlexIFEM Indi via simple software upgrade |
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Key Features
Key features |
Description |
Drift compensation |
State-of-the-art drift compensation for highest accuracy Standard piezoelectric amplifiers are subject to drift, meaning that at constant cylinder pressure the output voltage signal does not remain constant as one would expect, but drifts towards either end of the output range. Such electric drift can have different root causes (e.g. low input isolation) and is inherent to the piezoelectric measurement chain, but can be compensated for so that the amplifier delivers a constant voltage at constant cylinder pressure. |
Peak firing pressure measurement |
More than just an amplifier. Via built-in digitalization of the cylinder pressure signal and LCD display the AVL FI Piezo and FlexIFEM amplifiers optionally offer the possibility to detect engine cycles, display cycle-based pressure curves, and calculate peak firing pressure or engine speed. |
SDM Sensor Data Management |
Increasing efficiency due to organized workflow SDM guarantees end-to-end automated data transfer and thus ensures error free measurements. This solution covers the complete measurement chain running from the sensor to the post-processing software. AVL Sensor Data Management™ SDM consists of several hardware and software components:
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