Method and system for increasing vacuum generation by an engine

摘要

A method and a system for providing vacuum via an engine are described. In one example, introduction of a gaseous fuel is ceased in response to a request for the engine to provide vacuum to a vehicle vacuum system.

主权项

1. A method for operating an engine, comprising:
injecting fuel to a cylinder of the engine via a port injector or a direct injector in absence of a vacuum request; and deactivating the port injector and operating the direct injector in presence of the vacuum request.