Method and system for charge air system valve diagnosis

摘要

Various methods and systems are provided for diagnosing the position and function of a valve in an engine system. In one embodiment, a method for an engine comprises determining a position of a valve in an engine system based on a turbine speed response upon commanded actuation of the valve.

主权项

1. A method, comprising:
via a controller of an engine system:
communicating information relating to a first valve in the engine system based at least in part on a turbine speed response to actuation of the first valve while maintaining a second valve in one of a fully open and fully closed position during actuation of the first valve, where the first valve and the second valve are both positioned in a flow of gas including at least some exhaust gas, wherein the information comprises a position of the first valve that is determined based at least in part on the turbine speed response to actuation of the first valve and the fully open or fully closed position of the second valve and wherein the actuation of the first valve includes a command generated in response to a diagnostic cycle, where the diagnostic cycle is triggered if the first valve has not been actuated for a set amount of time.