Method for diagnosing the adjustment device of a swirl control valve
AssigneeSiemens Aktiengesellschaft
InventorsRobert Fromm, Johann Graf, Michael Henn, Hong Zhang
Life of this patent
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Abstract
The activation of a swirl control valve which is seated downstream of a throttle valve in the intake tract of an internal combustion engine is diagnosed. The swirl control valve is activated by a specific adjustment travel within a supercritical operating range of the intake pipe pressure in the intake tract downstream of the throttle valve. If a specific jump in pressure that is dependent on the adjustment travel does not take place in the intake tract downstream of the throttle valve, a defect in the actuation of the swirl control valve is diagnosed.
Claims11
A method of diagnosing an activation of a swirl control valve disposed downstream of a throttle valve in an intake tract of an internal combustion engine, which comprises:
- actuating the swirl control valve by a predefined adjustment travel within a supercritical operating range of an intake pipe pressure in the intake tract downstream of the throttle valve during lambda-l-controlled operation of the internal combustion engine;
- and if a specific stepwise pressure change dependent on the adjustment travel does not take place in the intake tract downstream of the throttle valve, diagnosing a defect in the activation of the swirl control valve.
Dependencies are inferred from the claim text.