Method for operating an internal combustion engine and system and with sulfur-rich exhaust gas purification component and an internal combustion engine system operable therewith
AssigneeDaimlerChrysler AG
InventorsJürgen Schmidt, Gerd Tiefenbacher, Anton Waltner
Life of this patent
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Abstract
A method for operating an internal combustion engine system includes operating the internal combustion engine system in a desulfurization mode each time following a cold-start of the engine prior to the transition to a normal operating mode. The internal combustion engine system includes (1) an exhaust line; (2) a sulfur-rich exhaust purification component comprising at least two exhaust purification units connected in series in the exhaust line; and (3) a secondary air supply having separate branches for the sulfur-rich exhaust purification units.
Claims3
A method for operating an internal combustion engine system comprising an exhaust line;
- a sulfur-rich exhaust purification component located in the exhaust line;
- and a secondary air device, said method comprising:
- desulfurizing the sulfur-rich exhaust purification component following each cold-start of the engine;
- subsequently operating the engine in a normal operating mode;
- and
- determining a duration of the desulfurizing based upon an estimate of an amount of sulfur contained in the sulfur-rich exhaust purification component as a function of fuel, the sulfur content of the fuel, and desulfurization processes that occur during the normal operating mode.
A method for operating an internal combustion engine system comprising an exhaust line;
- a sulfur-rich exhaust purification component comprising a plurality of exhaust purification units connected in series located in the exhaust line;
- and a secondary air device, said method comprising:
- following each cold-start of the engine, heating the sulfur-rich exhaust purification component to a predetermined temperature;
- supplying secondary air at one or more points in the exhaust line to the sulfur-rich exhaust purification component or to an exhaust line section upstream of the sulfur-rich exhaust purification component during said heating;
- terminating said supplying of secondary air;
- switching to desulfurizing the sulfur-rich exhaust purification units in sucession;
- introducing secondary air into the exhaust line at one or more points downstream of the corresponding sulfur-rich exhaust purification unit undergoing desulfurization;
- and
- subsequently operating the engine in a normal operating mode.
Dependencies are inferred from the claim text.