Method and system for prioritizing vehicle vacuum

摘要

A vacuum prioritization system for a vehicle is disclosed. In one example, use and availability of vacuum provided via vacuum sources is allocated to higher priority vacuum operated actuators when a pressure in the vacuum system exceeds a threshold pressure. The lower priority vacuum operated actuators have access to vacuum supplied via the vacuum sources when pressure in the vacuum system is less than a threshold pressure. The approach may allow higher priority actuators to operate for an extended amount of time.

主权项

1. A vacuum prioritization method for a vehicle, comprising:
providing vacuum via at least one vehicle vacuum source solely to a first actuator group when a pressure of a first vacuum reservoir is greater than a first threshold pressure; providing vacuum via the at least one vehicle vacuum source to the first actuator group and a second actuator group when the pressure of the first vacuum reservoir is less than the first threshold pressure; and supplying vacuum to the second actuator group via a second vacuum reservoir when the pressure in the first vacuum reservoir is greater than the first threshold pressure.