| 发明名称 | Distinguishing between EGR valve and oxygen sensor degradation | ||
| 摘要 | A diagnostic method for an engine having a valve for controlling dilution of intake air. The method comprises, during engine fueling, indicating a degradation of the valve when the valve is commanded closed but sensor output corresponds to an oxygen level below that of air. The method further comprises, absent engine fueling, indicating degradation of the sensor when the valve is commanded closed but the sensor output corresponds to an oxygen level below that of air. | ||
| 申请公布号 | US8775011(B2) | 申请公布日期 | 2014.07.08 |
| 申请号 | US201113089026 | 申请日期 | 2011.04.18 |
| 申请人 | Ford Global Technologies, LLC | 发明人 | Makki Imad Hassan;Kerns James Michael;Clark Timothy Joseph;Jentz Robert Roy;Uhrich Michael James |
| 分类号 | G01M17/00;B60T8/88;B60T13/52;B60T17/02 | 主分类号 | G01M17/00 |
| 代理机构 | Alleman Hall McCoy Russell & Tuttle LLP | 代理人 | Voutyras Julia;Alleman Hall McCoy Russell & Tuttle LLP |
| 主权项 | 1. A diagnostic method for an engine having a valve for controlling dilution of intake air, the method comprising: supplying the intake air to an intake manifold of the engine, an oxygen sensor coupled upstream of the intake manifold providing an output; indicating over-limit degradation of the sensor when sensor output corresponds to an oxygen level above that of air; during engine fueling, indicating degradation of the valve when the valve is commanded closed but the sensor output corresponds to an oxygen level below that of air; and absent engine fueling, indicating under-limit degradation of the sensor when the valve is commanded closed but the sensor output corresponds to an oxygen level below that of air. | ||
| 地址 | Dearborn MI US | ||