Compressor pressure when boosted (L) affects both membranes (5) and pulls the adjusting flap (4) right. As a result, the excess pressure channel opens (U) to high pressure fuel pump (injection pump), and in the cylinder (3) applied transient pressure decreases (T). Spring (1) at the same time, it shifts the high-pressure fuel pump that presses on the distribution plunger (2) contact shoe and thereby increases the piston stroke. Thus, the amount of injected fuel is increased.
Diesel with turbocharger
Below and slightly to the side on the high-pressure fuel pump of a diesel engine with a turbocharger, there is an additional housing element - boost pressure enrichment. This device ensures that the volume of air injected by the turbocharger is mixed with the appropriate amount of fuel - namely, depending on the specific boost pressure. This circuit works as follows: the boost pressure from the intake pipe acts through the hose on the diaphragm in the housing. As a result, the membrane bends and transmits this movement through the pusher and thrust square with the heel to the same control sleeve, which is affected by the centrifugal regulator. If the boost pressure increases, then the control sleeve rises above the outlet of the injection pump distributor plunger. The excess fuel removed up to this point can no longer flow out, but begins to flow into the injection. Thus, more fuel is delivered at high boost pressure.