Turbocharger (TC) Control System B52X4T: Notes

WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Turbocharger (TC) Control System

Courtesy of VOLVO CARS OF NORTH AMERICA.

Turbocharger (TC) boost pressure is controlled by the boost pressure control (BPC) valve whose pressure regulator is affected by the pressure from the turbocharger (TC).

The engine control module (ECM) determines current throttle angle and boost pressure to achieve the calculated torque.

The Engine Control Module (ECM) affects the controlling pressure using the turbocharger (TC) control valve.

When the pressure increases the boost pressure control (BPC) valve pressure regulator is affected. When boost pressure has increased to the maximum permissible value the boost pressure control (BPC) valve opens and part of the exhaust gases bypass the turbocharger (TC) turbine which limits the boost pressure. Turbocharger (TC) control takes place constantly by measuring the current boost pressure and comparing it to the requested boost pressure.