SYSTEM AND METHODS FOR PURGING RESIDUAL EXHAUST AND UNCOMBUSTED FUEL TO AN EXHAUST CATALYST

摘要

A method for an engine is provided. Following an engine-off event, engine cylinders are sequentially positioned with an intake valve open and an exhaust valve open. The contents of the engine cylinder are then purged to an exhaust catalyst. In this way, existing vehicle hardware may be used to evacuate residual hydrocarbons and uncombusted fuel to the exhaust catalyst, provided the catalyst remains above the light-off temperature.

主权项

1. A method for an engine, comprising:
following an engine-off event, positioning a first engine cylinder with an intake valve open and an exhaust valve open; and purging contents of the first engine cylinder to an exhaust catalyst.