1. Why is the AVL Indimodul particularly suited for the indicating tasks on the motorcycle test stand?
Due to its modular system design, the AVL Indimodul 621 is a flexible and powerful tool to cover the accruing tasks.
The main tasks are positioned in the field of the combustion development and reduction of cycle to cycle variation as well as the optimisation of the fuel consumption.
Both the “classic” applications for an indicating system and special applications which the manufacturer of the system may not have thought about can be covered. Due to the option of being able to process the measuring values very flexibly by means of CalcGraf, the Indimodul is also used as a quick data recording system both time based as well as crank angle based, along with the use as indicating system. The rotatary analysis and the analysis of the valve dynamics can be taken as an example here.
The measuring system can be operated relatively easily and as it is related closely to the CONCERTO the user can familiarise very quickly with the system.
The direct coupling with the PUMA test stand system provides a uniformly operatable environment that can be used efficiently by many users. The combination of PUMA – IndiCom – CONCERTO is a consistent environment in which a large part of the tasks accruing on the test stand is processed. On the one hand this reduces the number of required different measuring systems and on the other hand the time necessary for training measures is also reduced substantially, as only a small number of tools is in charge. This integration of the different systems also results in an improved data storage, as there is a clear assignment of the networked data, even if not all systems use the same data format, and only one analysis tool is needed.
In this respect, the decision to purchase an AVL ramp calibration system also is another step in the direction of an application structure that is as homogeneous and consistent as possible.
2. Which are the goals when you examine the charge flow in the intake manifold using the AVL VisioScope?
AVL-VisioScope provides us with a better understanding of mixture preparation and of effects of different changes of injection parameters. Measurements using VisioScope play an important role when developing the injection hardware as well as during the calibration itself.
During the hardware development phase the main focus is particularly on targeting and checking the design of throttle and injection injector.
Its use during the calibration phase is aimed at the visualization of injection timing and wall film formation. The good interface between IndiModul and VisioScope is a great advantage during this process facilitating the evaluation and the use of both systems. Thus, during the work at the test bed, the effect of modifications can be directly checked using the systems. Interactions can be immediately seen.
3. Which angle encoder do you use for your quick data acquisition and which advantages does this angle sensor have?
In addition to the open version - the angle encoder AVL 365X - we have recently started to use the closed version AVL 365C which has proved to be very durable compared to the last version as well as reliable even for high-speed applications.
Due to the high speed and the low inertia of our engines the angle encoder is a critical part of the measuring chain which caused us problems time and again.
In the past we were mostly only able to use the open 364X angle encoder (reflection principle) which was, however, not very easy to use and was difficult to apply. In addition, the design was very sensitive to dirt and extraneous light especially at high resolution operation (pulse multiplication).
The new generation AVL 365X which is based on the transmission light principle brought significant improvements in this respect and thus lowered maintenance costs and provided longer measuring times with high resolution. The new generation also proved to be a lot more tolerant when mounting and less sensitive when operating compared to its predecessor.
With the latest generation - the closed version AVL 365C - it is now also possible to operate this angle encoder at our engines with larger displacements and relatively low speed n < 11000 rpm.
The closed design protects the optical components thus providing better reliability and enabling the in-vehicle use on the chassis dynamometer as well as on the road.
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