Method for operating an internal combustion engine with a turbocharger arrangement and control unit for an engine with a turbocharger arrangement

摘要

Methods are provided for controlling an engine. One method may include adjusting airflow to a turbocharger arrangement with a turbine bypass valve bypassing a first turbine from a high-pressure turbocharger and a wastegate bypassing a second turbine from a low-pressure turbocharger; responsive to valve degradation, setting the turbine bypass valve fully open and the wastegate fully closed; and limiting engine torque based on a flow through a compressor of the low pressure turbocharger. In the event of valve degradation, limiting torque may reduce overspeed and surge of the low pressure turbocharger.

主权项

1. A system for an internal combustion engine, comprising:
a turbocharger arrangement comprising a low-pressure and a high-pressure stage arranged sequentially, the low-pressure stage comprising a low-pressure compressor, and a turbine bypass valve and wastegate each actuated by a supply system; and an engine controller configured for:
detecting degradation in the supply system,responsive to the detection of degradation in the supply system, setting the turbine bypass valve fully open and the wastegate fully closed,determining a low-pressure compressor flow, andlimiting an engine control parameter setpoint depending on the low-pressure compressor flow.