| US 7,500,354 B2 | ||
| Method for operating an internal combustion engine that is equipped with a three-way catalytic converter | ||
| Wolf-Dieter Pöhmerer, Colomiers (France); and Gerd Rösel, Regensburg (Germany) | ||
| Assigned to Siemens Aktiengesellschaft, Munich (Germany) | ||
| Appl. No. 10/513,509 PCT Filed May 02, 2003, PCT No. PCT/DE03/01407 § 371(c)(1), (2), (4) Date Nov. 05, 2004, PCT Pub. No. WO03/095817, PCT Pub. Date Nov. 20, 2003. |
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| Claims priority of application No. 102 20 337 (DE), filed on May 07, 2002. | ||
| Prior Publication US 2005/0166578 A1, Aug. 04, 2005 | ||
| Int. Cl. F01N 3/00 (2006.01) | ||
| U.S. Cl. 60—285 [60/274] | 9 Claims |
| 1. A method for operating an internal combustion engine equipped with a three-way catalytic converter, comprising:
setting a lambda value of the air/fuel mixture, with which the internal combustion engine is supplied, below and above a stoichiometric
set value in a cyclically alternating manner during a forced activation, the lambda value in rich phases being less than the
stoichiometric set value and in lean phases being greater than the stoichiometric set values; and
matching during the forced activation, the rich phases and the lean phases to one another according to a specified criterion,
wherein
based on an air mass flow that is supplied to the internal combustion engine in the rich and lean phase, a volume is determined
for an oxygen mass relevant to a filling or emptying process of a three-way catalytic converter and used as a criterion to
determine the switching points between the rich and the lean phases, and wherein the amount by which the lambda value in rich
phases is set below the set value is selected so that it is equal to the amount by which the lambda value in lean phases is
set above the set value.
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