发明名称 |
Methods for variable displacement engine diagnostics |
摘要 |
Methods and systems are provided for monitoring cylinder valve deactivation in an engine operating with a plurality of cylinder valves. One example method comprises, sensing a plurality of cylinder valve positions of a plurality of cylinder valves; and combining the plurality of sensed positions to form a combined cylinder valve signal. The method may further include identifying valve degradation and differentiating valve degradation among the plurality of cylinder valves based on the combined cylinder valve signal and an expected value of the signal, and further based on a crank angle at which the expected value differs from the combined signal.
|
申请公布号 |
US7546827(B1) |
申请公布日期 |
2009.06.16 |
申请号 |
US20080196167 |
申请日期 |
2008.08.21 |
申请人 |
FORD GLOBAL TECHNOLOGIE, LLC |
发明人 |
WADE ROBERT ANDREW;DOERING JEFFREY ALLEN;ROLLINGER JOHN ERIC;GOODWIN WILLIAM RUSSELL |
分类号 |
F01L13/00 |
主分类号 |
F01L13/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|