The actual boost pressure is then compared to the desired boost pressure after correction to obtain a boost pressure error signal.
When boost control is supplied, state the characteristic fuel delivery and boost pressure versus engine speed
In a boost mode, the VGT system is controlled with a closed loop based on boost pressure.
If boost control is supplied, state the characteristic fuel delivery and boost pressure versus engine speed.
A boosting device providing a 1.7 bar absolute or greater boost pressure level is connected to the intake manifold.
A control supercharge pressure (Psu*) is set with the target supercharge pressure (Psutag) limited with the upper bound supercharge pressure (Psulim) (S180).
An ECU (70) controls the variable nozzle mechanism (14c) so that an actual supercharging pressure detected by a supercharging pressure sensor (74) matches a target supercharging pressure.
This control device operates a throttle on the basis of the target intake pressure and the actual supercharge pressure, and operates a wastegate valve on the basis of the target supercharge pressure.
The Waste gate valve (7) comprises a drive device (9) applying, to the Waste gate (7), a specified force from the downstream side to the upstream side of the communication passage (6).
The invention relates to a turbocharger comprising a wastegate duct (12) that can be opened and closed by means of an actuator.