发明名称 |
System and method for reducing NOx emissions during transient conditions in a diesel fueled vehicle with EGR |
摘要 |
The present invention is a dual-stage fuel injection strategy for compression ignition engines in which 15-40% of the fuel is injected into the combustion chamber no later than about −20 to −30 CA ATDC and as early as IVC. The remaining fuel is then injected in one or more fuel pulses, none of which start before about −20 to −30 CA ATDC. The fuel injected early in the compression stroke forms a lean mixture that burns with low soot and low NOx emissions. The combustion of that fuel serves to increase in-cylinder temperature such that the ignition delay of subsequent fuel injection pulses is short. This mode is utilized when it is predicted that a NOx spike is imminent. Various other alternative methods for reducing NOx spikes are also disclosed such as specialized EGR systems that can provide EGR with low manifold vacuum.
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申请公布号 |
USRE42609(E1) |
申请公布日期 |
2011.08.16 |
申请号 |
US20090568988 |
申请日期 |
2009.09.29 |
申请人 |
FORD GLOBAL TECHNOLOGIES, LLC |
发明人 |
KURTZ ERIC MATTHEW;VANDERSLICE JOHN H. |
分类号 |
F02M45/02;F02B1/12;F02B3/06;F02B23/06;F02B29/04;F02D41/00;F02D41/40;F02M25/07;F02M51/00 |
主分类号 |
F02M45/02 |
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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