Method and device for operating an internal combustion engine comprising an exhaust gas cleaning unit
AssigneeDaimler AG
InventorBerthold Keppeler
Life of this patent
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Abstract
A method for operating an internal combustion engine having an exhaust emission control unit with at least one exhaust emission control component which acts catalytically and/or by filtration involves operating the internal combustion engine, during a cold start or warm-up of the internal combustion engine, using a cold start engine operating process with predefined values for predefined internal combustion engine operating variables. The cold start and/or the warm-up of the internal combustion engine is controlled or regulated as a function of soot loading of a particle filter of the exhaust emission control unit.
Claims8
A method for operating an internal combustion engine having an exhaust emission control unit that includes a particle filter, the method comprising:
- operating, during a cold start or a warm-up of the internal combustion engine, the internal combustion engine using a cold start engine operating process with predefined values for predefined internal combustion engine operating variables;
- determining a soot loading of the particle filter;
- and
- controlling or regulating the cold start or the warm-up of the internal combustion engine as a function of the soot loading of the particle filter, wherein:
- in a first operating state when the particle filter is unloaded, the controlling or regulating involves heating the exhaust emission control unit to a predefined maximum temperature, using a predefined maximum temperature gradient,
- in a second operating state when the particle filter has a soot loading exceeding a predefined first threshold value, the controlling or regulating involves heating the exhaust emission control unit in such a way that a temperature in the particle filter remains below an ignition temperature of soot stored in the particle filter, and
- in a third operating state when the particle filter is partially loaded with a soot loading below a predefined second threshold value, the exhaust emission control unit is heated to a predefined operating temperature above an ignition temperature of the stored soot, using a predefined maximum temperature gradient, resulting in ignition of the soot.
A device for operating an internal combustion engine having an exhaust emission control unit that includes a particle filter, the device comprising:
- an electronic engine control unit configured to:
- operate, during a cold start or a warm-up of the internal combustion engine, the internal combustion engine using a cold start engine operating process with predefined values for predefined internal combustion engine operating variables;
- determine a soot loading of the particle filter;
- and
- control or regulating the cold start or the warm-up of the internal combustion engine as a function of the soot loading of the particle filter, wherein:
- in a first operating state when the particle filter is unloaded, the controlling or regulating involves heating the exhaust emission control unit to a predefined maximum temperature, using a predefined maximum temperature gradient,
- in a second operating state when the particle filter has a soot loading exceeding a predefined first threshold value, the controlling or regulating involves heating the exhaust emission control unit in such a way that a temperature in the particle filter remains below an ignition temperature of soot stored in the particle filter, and
- in a third operating state when the particle filter is partially loaded with a soot loading below a predefined second threshold value, the exhaust emission control unit is heated to a predefined operating temperature above an ignition temperature of the stored soot, using a predefined maximum temperature gradient, resulting in ignition of the soot.
Dependencies are inferred from the claim text.