In old-fashioned banks, the operator or the observer had to manually recording the simultaneous measurements on paper.
Nowadays, most banks replacing the observer notes with computerized devices that acquire and store the data.
Due to the very loud noise is generated by the bank and the engine, a performance test is stressful for everyone watching. In these circumstances it is very difficult to manually register all the data.
A reliable automated data acquisition system is regarded as indispensable today under engine builders and testers. Today it is possible to buy the recording, monitoring, and playback capabilities in a palm sized package, which many years ago would have cost much more, and had the size of a refrigerator.
An appropriate computerized data acquisition system must have a very fast sampling rate. To obtain data on the quality, you must be at least 100 samples, of all sensor channels per second (100Hz). A 200Hz rate caps or more is even better. It is important to remember that between spark plug firing there is a decrease in the torque and rpm that can be measured. The crankshaft is accelerated immediately after combustion occurs and then it slows down until the plug will fire again. It is not possible to detect this rapid ups and downs when you drive on the track or road, but the bank wants.
Therefore, there is a 200 Hz logging price for data-acquisition system should do the trick, as well as an appropriate dynamometer.
If you have a sample just 50Hz, you should consider that the capture of a single sample speed torque and any revolution. From time to time, a series of samples will synchronize with the firing of the plugs, and sometimes the data samples will be in sync with some lower power compression stroke. If you have a fast and reliable system that read each cycle multiple times, then the data captured can be used for the average of the data phenomenon.
Averaging time the data is a very important step in the data-acquisition system.
At this point, while experienced operators see an identical chassis power curve in the two graphs, Dyno inexperienced operators expect a smooth, clear line.
The reason why the average and the ability to dampen the data is essential for the acquisition system is that you do not have to deal with so many prints.
For instance, at 100Hz, you get 1000 lines of data, even for a ten seconds dynamometer pull. You can choose not to look for small changes in dozens of pages of data each time you want to prepare for another run. Averaging Time eliminates both transient noise and produces clear print, and it is therefore very useful in the process of entering data from the bank.
