| US 7,610,895 B2 | ||
| Method of operating an internal combustion engine in an engine warm-up phase | ||
| Matthias Klingebiel, Waiblingen (Germany); Roland Lütze, Leonberg (Germany); and Heiko Sass, Tamm (Germany) | ||
| Assigned to Daimler AG, Stuttgart (Germany) | ||
| Filed on Sep. 10, 2007, as Appl. No. 11/900,196. | ||
| Application 11/900196 is a continuation in part of application No. PCT/EP2005/012612, filed on Nov. 25, 2005. | ||
| Claims priority of application No. 10 2004 059 004 (DE), filed on Dec. 08, 2004. | ||
| Prior Publication US 2008/0066724 A1, Mar. 20, 2008 | ||
| Int. Cl. F02B 3/00 (2006.01) | ||
| U.S. Cl. 123—299 [123/568.12; 701/103] | 13 Claims |
| 1. A method of operating an internal combustion engine during engine warm-up, said engine including a cylinder with a piston
defining a combustion chamber and a fuel injection device for a direct injection of fuel into the combustion chamber, and
further a coolant circuit and an exhaust gas recirculation device for re-circulating exhaust gas to the combustion chamber,
said method comprising the steps of:
injecting fuel into the combustion chamber of the internal combustion engine in a pilot injection, main injection and, selectively,
a post-injection,
operating the internal combustion engine in a heat-up phase as a function of a coolant temperature of the engine, wherein
a center position of the combustion is moved in a heating mode in a late direction relative to a center position of the combustion
in a normal engine operating mode, and
in order to increase a generation and transfer of heat to the coolant during the heat-up phase, the fuel is injected during
the pilot injection in the form of at least two distinct partial quantities.
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