发明名称 |
Vacuum decay testing method |
摘要 |
A method and system are disclosed for determining whether a leak is present in an evaporative emission control system 10 for on-board diagnostic purposes. The method comprises predicting for a leak of predetermined size the time period required for the vacuum to fall from a predicted starting vacuum to a predetermined level of vacuum at which the state of a switch changes, checking at the end of the time period the state of the switch and using the state of the switch as an indication of whether a leak greater than the predetermined size is present in the evaporative emission control system. |
申请公布号 |
US8327691(B2) |
申请公布日期 |
2012.12.11 |
申请号 |
US20090552874 |
申请日期 |
2009.09.02 |
申请人 |
DRANE ROBIN J.;WRIGHT NICK;FORD GLOBAL TECHNOLOGIES, LLC |
发明人 |
DRANE ROBIN J.;WRIGHT NICK |
分类号 |
G01M3/04 |
主分类号 |
G01M3/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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