| US 7,346,446 B2 | ||
| Fuel reforming estimation in HCCI engines | ||
| Jun-Mo Kang, Ann Arbor, Mich. (US); Chen-Fang Chang, Troy, Mich. (US); and Tang-Wei Kuo, Troy, Mich. (US) | ||
| Assigned to GM Global Technology Operations, Inc., Detroit, Mich. (US) | ||
| Filed on Oct. 03, 2006, as Appl. No. 11/538,082. | ||
| Claims priority of provisional application 60/724191, filed on Oct. 06, 2005. | ||
| Prior Publication US 2007/0124055 A1, May 31, 2007 | ||
| Int. Cl. F02M 27/02 (2006.01) | ||
| U.S. Cl. 701—108 [123/3; 123/568.21] | 14 Claims |
| 1. Method for estimating fuel reformation in an internal combustion engine employing exhaust gas recompression valve control
and fuel injection during exhaust gas recompression comprising:
calculating a first exhaust gas burned gas fraction based on at least one linear oxygen sensor disposed in the exhaust gas
stream;
modeling a second exhaust gas burned gas fraction based on air actually consumed in in-cylinder fuel combustion and reforming
processes;
modeling a third exhaust gas burned gas fraction based on air required to complete in-cylinder combustion reactions of reformed
fuel; and
calculating fuel reformed based on the first, second and third exhaust gas burned gas fractions.
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