Turbocharger control system for e.g. diesel engine in off highway truck, has controller determining control signal based on comparison of turbocharger speed and threshold value, and linear actuator moving valve towards positions

摘要

The system (10) has a wastegate valve (28) connected between an exhaust manifold (18) and a turbine section (22) of an internal combustion engine (14) e.g. diesel engine. Sensors (44, 50, 54, 60, 61) sense speed, boost pressure, rack position, barometric pressure, speed of a turbocharger (12) of the engine and respectively deliver speed, boost, position, barometric pressure and turbocharger speed signals. A controller (58) determines a control signal based on comparison of the turbocharger speed and a threshold value. A linear actuator (84) moves the valve to open or closed positions. An independent claim is also included for a method for controlling turbocharger boost pressure of an internal combustion engine.