| 摘要 |
<p>A system (10) and method for controlling a vacuum operated exhaust brake (410). A vehicle may be provided with service brake assistance (200) and an exhaust brake (410), each of which may be driven by a common vacuum source (100). In the event the available vacuum is likely to be insufficient to meet the demand of the service brake assistance system (200), the exhaust brake (410) may be selectively isolated from the vacuum source (100). Exhaust brake (410) isolation may be responsive to a sensed vacuum parameter, such as the magnitude of the vacuum and/or the rate of change of the vacuum. Vacuum communication between the exhaust brake (410) and the vacuum source may be reestablished responsive to the sensed vacuum parameter.</p> |
