| 摘要 |
The invention relates to a method for setting the temperature of an exhaust gas aftertreatment device (1) connected to an internal combustion engine, comprising an electric heating element (5), an oxidation catalyst (6) which is connected downstream of the heating element (5), and an SCR catalyst (8) which is connected downstream of the oxidation catalyst (6). The temperature values for a current temperature of the oxidation catalyst (6) and the SCR catalyst (8) are continuously ascertained, and injection parameters of injection processes for fuel injections into the combustion chambers of the internal combustion engine and a heating output (PI) of the heating element (5) are set dependent on the ascertained temperature values. A characteristic temperature value which is assigned to a specified conversion threshold is assigned to the oxidation catalyst (6) and the SCR catalyst (8). According to the invention, a first characteristic temperature value (T1, T1') for an oxidative carbon monoxide conversion and a second characteristic temperature value (T2, T2') for an oxidative hydrocarbon conversion are assigned to the oxidation catalyst (6), and a third characteristic temperature value (T3, T3') for a reductive NOx conversion is assigned to the SCR catalyst. Different respective values for the injection parameters and/or the heating output (P1) are set upon reaching the first and the second characteristic temperature value (T1, T1', 12, 12') for the temperature of the oxidation catalyst (6) and upon reaching the third characteristic temperature value (T3, T3') for the temperature of the SCR catalyst (8). |
