| 摘要 |
A procedure is introduced to test the functional capability of a secondary air system of an internal combustion engine, wherein values of a pressure are acquired, which arises in the secondary air system between the secondary air pump and a secondary air flow cross section, which can be controlled, when the secondary air pump is activated and the actuation of the secondary air flow cross section is increased; in that a measurement for the pressure is developed from the acquired values and is compared with a set point value, and the functional capability of the secondary air system is assessed as a function of a result of the comparison. The procedure characterizes itself in such a way, that in a secondary air system, whose secondary air flow cross section is controlled by two secondary air valves, wherein one of the two secondary air valves is actuated to close, while the other one of the two secondary air valves is actuated to open, and the assessment of the functional capability for a section of the secondary air system occurs in the section, in which the secondary air valve actuated to open is disposed. In addition a control unit is introduced, which controls the sequence of such a procedure.
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