Here is an example from an article I did a while back:

http://photos.motoiq.com/MotoIQ/Tech/Tu ... ed-5-L.jpg

You caption your example of an injector current wave as: "It can be clearly seen from the example waveform that the waveform is clearly 'split' into two easily defied areas. The first part of the waveform is responsible for the electromagnetic force lifting the pintle, in this example the time taken...