The present invention relates to a method and an apparatus for defining a moment of injection during the start process of an internal combustion engine.
The determination of the dosage of fuel during the start of the internal combustion engine has been always problematic to a certain extent, particularly when low or extremely low start temperatures prevail during the starting process. On the one hand, it is required that the cold internal combustion engine be supplied with a certain quantity of fuel in order to compensate for the condensation effect on the cold walls of the cylinders and conduits of the system and to ensure the fastest and sure start of the internal combustion engine, and, on the other hand, the fuel mixture should not be overfattened because in this case the motor may not start at all. Furthermore, a possible increased weakness of the battery which can occur at low start temperatures should be taken into consideration. It is known that the amount of fuel injected during the start process of the internal combustion engine should be carefully adjusted to environment temperatures and to the operation conditions of internal combustion engine, and also to the age and history of the motor; however in the injection installations, in which an intermittent injection has been utilized, difficulties or troubles can occur in the area of an electrically actuated injection valve; then a low voltage of the main power supply, which is supplied back to a loaded battery immediately during the start process, leads to divergence of the start moments in the electromagnetic injection valve from normal or desired.