Common Rail 5 - Calculations
One should be extremely careful when working at an ongoing CR engine and even a little wait with assembly work even after its shutdown. In sudden leaks threaten up to 2,500 bar, or even more. That means 250
million N acts upon 1 m² or 25,000 N upon 1 cm², comparable, a loaded, fully grown SUV parked on your fingernail, not with one wheel but completely.
Even otherwise well worth to use mathematics for car technology. The smallest injection quantity is often expressed with 1 mm³. That would be for four cylinders and 800 rpm 1.6 cm³ consumption per minute or 1.6
dm³ or liters per hour. So definitely there is no multiple injection at idle speed and as some diesel consume even less than 1.6 L/h, either less rpm or less injection quantity.
50 mm³ should be the full load amount. Let us take again an SUV. At 3600 rpm this would be 360,000 mm³ per minute or 360 cm³ or 0.36 dm³, 21.6 liters in relation to the hour and at a speed of 160 km/h 13.5
liters/100km. For a truck that drives with 6 cylinders at 1400 per minute and 80 km/h the amount has to be doubled and with full load tripled again.
An injection should last at least 1 ms. In 3600 rpm or 60 rps, a power stroke takes just over 8 ms. Main injections are only useful long before the half.From this and from the signals pictured above, one can conclude
that injections of less than one millisecond duration are widely available. Realising the potential of up to eight injections of CR motor can probably playout more at much lower speed. 07/16
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