The control pressure regulator ensures the enrichment of the working mixture entering the combustion chambers when the engine warms up. On a cold engine, the bimetal spring compresses the diaphragm valve spring, opening the fuel drain channel, which leads to a decrease in resistance on the distribution plunger. A decrease in control pressure at a constant air flow causes an increase in the stroke of the pressure disc. As a result, the distribution plunger is additionally raised, increasing the amount of fuel supplied to the injectors.
As the bimetal spring heats up, the pressure on the diaphragm spring of the other control pressure regulator valve decreases and the drain channel slowly closes. The control pressure reaches a normal value and the enrichment of the combustible mixture stops.
The pilot pressure regulator is mounted on the cylinder block, so that its temperature changes at the same time as the engine temperature. This eliminates excessive enrichment of the working mixture at an average temperature.