首页>
外国专利>
Combination pressure- and vacuum-based EVAP leak detection method
Combination pressure- and vacuum-based EVAP leak detection method
展开▼
机译:基于压力和真空相结合的EVAP泄漏检测方法
展开▼
页面导航
摘要
著录项
相似文献
摘要
A method and system for conducting leak detection in an evaporative emission control system. The method performs a pressure-based leak test at selected intervals. The pressure-based test includes pressurizing the system, using a pump. Then, the system monitors pressure for a selected period. If system pressure falls below a threshold value during the selected period, the system identifies an initial leak. Upon identifying the initial leak, the system substitutes a vacuum-based leak test at each selected interval. The vacuum-based test includes evacuating the system, using the pump. The system then monitors system pressure for a selected period. If system pressure rises above a threshold value during the selected period, then the system identifies a subsequent leak. Upon receiving notification that the initial leak has been repaired, the system returns to pressure-based leak testing. Where a single pump is used, that pump is configured both for system pressurization and evacuation.
展开▼