Patent ID: 7513106

Claim:
An engine for reducing buildup in an exhaust gas recirculation system when mixing hydrocarbons with exhaust comprising: an exhaust system including: a first engine cylinder in communication with a first injection system, the first injection system configured to inject hydrocarbons into the first engine cylinder; a first exhaust passage in communication with the first engine cylinder; the first injection system configured to provide hydrocarbons to the first exhaust passage when the first engine cylinder moves a first exhaust gas into the first exhaust passage; a second engine cylinder in communication with a second injection system, the second injection system configured to inject hydrocarbons into the second engine cylinder; a second exhaust passage in communication with the second engine cylinder; the second injection system inoperative when the second engine cylinder moves a second exhaust gas into the second exhaust passage; wherein the first exhaust passage and the second exhaust passage are separated from each other to inhibit entry of the first exhaust gas into the second exhaust passage.