Cold Start Control
During the start phase, fuel is injected several times for each cylinder group per crankshaft revolution. The quantity of fuel is adjusted depending on engine temperature and engine speed. In addition, the injection timing is retarded at higher engine temperatures and at slower engine cranking speeds. For example, on 12-cylinder engine, after the engine has started (as of approximately 600 RPM), fuel is injected only once per revolution of the crankshaft and cylinder group. See Fig 1. This means that during the first crankshaft revolution fuel is injected into cylinders No. 2, 4 and 6 simultaneously and during the second revolution into cylinders No. 1, 3 and 5. Cylinders No. 8, 10 and 12, and No. 7, 9 and 11 are supplied with fuel in the same way but offset by 60 degree crank angle.