Motor-Boost Pressure Servo: Operation
| 1 - COMPRESSOR HOUSING |
| 2 - GUIDE VANE |
| 3 - GUIDE STUD OF GUIDE VANE |
| 4 - GUIDE STUD OF CONTROL LINKAGE |
| 5- ADJUSTING RING |
| 6 - TURBINE HOUSING |
| 7 - TURBINE WHEEL |
| A - TURBO INLET (FRESH AIR) |
| B - TURBO OUTLET (COMPRESSED AIR) |
| C - EXHAUST GASES TO TURBINE WHEEL |
| D - EXHAUST OUTLET |
The turbocharger boost pressure servomotor receives a PWM signal from the ECM.
At low speed, the turbocharger boost pressure servomotor reduces the flow cross-section of the guide vanes. See Fig 1(2). The speed at which the exhaust gas impacts on the turbine wheel is increased, as a result of which the speed of the turbocharger and thus the charge pressure rises.
At high engine speed, the turbocharger servomotor increases the flow cross-section of the guide vanes. See Fig 1(2). The speed at which the exhaust gas impacts on the turbine wheel is reduced, as a result of which the speed of the turbocharger reduces and the charge pressure drops.