Boost Pressure Control Flap Actuator, Basic Function - GF09.50-P-2001A
Engine all (4xWD)
Engine all (CAR)
Overview
This document contains information on:
- General
- Function
- Exhaust gas turbocharger with variable blade geometry
- Exhaust gas turbocharger with fixed blade geometry
General
The boost pressure control flap actuator is responsible for raising or reducing boost pressure via the exhaust gas turbocharger.
As engine speed increases, the exhaust gas volume increases, which directly influences the rotational speed of the turbine wheel in the exhaust gas turbocharger. To ensure that the exhaust gas turbocharger operates within the specified delivery limit with regard to the engine operating point, boost pressure control via the boost pressure control flap actuator is required.
Function
Exhaust gas turbocharger with adjustable turbine geometry
After evaluation of the input signal, the CDI control unit regulates the position of the boost pressure positioner according to a characteristics map. According to the actuation, the boost pressure regulator adjusts the position of the guide vanes, which are positioned in a circular manner on a carrier ring that is connected via a shaft to the adjustment ring. The adjustment ring is in turn connected via the linkage to the boost pressure control actuator. The adjustable guide vanes modify the flow cross-section through which the exhaust gas flows to the turbine. The positioning travel of the actuator motor is determined via an integrated, inductive sensor.
Exhaust gas turbocharger with fixed turbine geometry
Boost pressure control is implemented by means of a continuous adjustment (adjustment angle of between 0 and 109°) of the boost pressure control flap. The boost pressure control flap actuator actuates - via a linkage - the boost pressure control flap that closes the bypass. Part of the exhaust flow is directed through the bypass past the turbine wheel, whereby the boost pressure is regulated and the turbine speed limited. In this way the boost pressure can be adapted to the current load demand on the engine. The positioning travel of the actuator motor is determined via an integrated, inductive sensor.
A DC motor, an induction-type sensor and an actuator housing are accommodated in the housing of the boost pressure control flap actuator.
| Component descriptions | |||
|---|---|---|---|
| Wastegate pressure transducer, component description | Model 223 | GF09.40-P-2155A | |
| Model 206 | GF09.40-P-2155C | ||
| Model 232 | GF09.40-P-2155F | ||
| Model 254 | GF09.40-P-2155H | ||
| Model 214 | GF09.40-P-2155K | ||
| Model 167 as of model year 2023 | GF09.40-P-2155M | ||
| Model 192 | GF09.40-P-2155R | ||
| Model 236 | GF09.40-P-2155S | ||
| Component description for boost pressure actuator | Model 223 | GF09.40-P-4020A | |
| Model 464 | GF09.40-P-4020J | ||
| Model 118, 177, 247 as of model year 2023 | GF09.40-P-4020L | ||
| Model 167 as of model year 2023 | GF09.40-P-4020M |