What is the voltage of the two wires of the electro-pneumatic pressure converter of BMW 740 wastegate valve?

The electro-pneumatic pressure converter of BMW 740 wastegate valve has two wires, one with a voltage of 6V and the other with a voltage of 3V. And strain resistors R 1, R2, R3 and R4 are required, which form a Whiston bridge and are bonded to the silicon diaphragm.

The main reason is that this kind of silicon diaphragm can be deformed under the action of absolute pressure in the manifold, which causes the resistance value of strain resistor R to change. The higher the absolute pressure in the manifold, the greater the deformation of silicon diaphragm, so the resistance value of resistor R changes. ..

Output characteristics of intake pressure sensor;

1. When the engine is working, with the change of throttle opening, the vacuum degree, absolute pressure and output signal characteristic curve in the intake manifold are all changing.

2. The absolute pressure in the intake pipe behind the throttle is detected in the D-type injection system. Under the condition of constant atmospheric pressure (standard atmospheric pressure is 10 1.3kPa), the higher the vacuum degree in the manifold, the lower the absolute pressure in the manifold.