Wastegate Solenoid: Description and Operation

Pressure Converter, Wastegate Valve

Pressure converter, wastegate valve
Two exhaust turbochargers are switched in parallel for turbocharging. The two exhaust turbochargers ensure a quick response, even at low engine speeds. Mechanical wastegate valves provide the charging pressure control. A portion of the exhaust gases is fed via the wastegate valve to the turbine.

Functional description
The charging pressure is regulated by the engine control via a wastegate valve. The wastegate valve is adjusted pneumatically by a diaphragm box. An pressure converter applies a partial vacuum to the diaphragm box.
The engine control activates the pressure converter by means of a pulse-width modulated signal. This sets a corresponding partial vacuum at the pressure converter, and this determined the opening angle of the wastegate valve.







Structure and inner electrical connection
The pressure converter is connected via a two-pin plug connection.
The pressure converter is a proportional valve. The pressure converter is supplied with voltage from terminal 15N. Activation by the engine control is pulse-width modulated.







Characteristic curve and setpoint values
The pressure converter is activated by a pulse-width-modulated signal. The duty cycle is between 15 and 65 % (depending on engine operation). The supply vacuum is 700 mbar. Depending on the duty cycle, the vacuum can be continuously adjusted.







Observe the following setpoint values for the wastegate valve pressure converter:

Size Value
Voltage range 10.8 to 16 V
Duty cycle (depending on engine 15 to 65%
operation)
Control voltage frequency 300 Hz
Vacuum build-up response time 200 ms
Resistance at 20 °C 9.8 to 11.2 Ohms
Temperature range -40 °C to 140 °C

Diagnosis instructions

Failure of the component
If the wastegate valve pressure converter fails, the following Behavior is to be expected:
- Fault entry in the engine control unit
- Emergency operation with substitute value

General notes
If activation by pulse width modulation fails, the pressure converter is activated in emergency operation with a fixed pulse duty factor.
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