METHOD AND SYSTEM FOR PROVIDING VACUUM FOR A VEHICLE

摘要

A method and system for improving vacuum generation for a vehicle is described. In one example, engine speed and alternator load are adjusted in an alternating manner to increase and amount of vacuum provide by an engine to a vacuum reservoir.

主权项

1. An engine method, comprising:
during a first condition, adjusting a first engine operating parameter and a second operating parameter in an alternating manner in response to a desired engine intake manifold vacuum; and during a second condition, reducing the first engine operating parameter followed by reducing the second engine operating parameter.