A control system for the fuel injection of an IC engine has a first calculating device for an amount of fuel injected directly into the induction manifold and then sucked into the combustion chamber. There is a second calculating device for the amount of fuel adhering to the walls of the manifold. Based on these two amounts , the correct amount of fuel is injected. A third calculation may also be undertaken, that of the amount of fuel passing through into the exhaust without being burnt in the combustion chamber. The air-fuel ratio of the exhaust is also evaluated. This is used to correct the air-fuel ratio at the engine input.
