Method for detecting failure of a pump assembly in a pump module
AssigneeRobert Bosch GmbH
InventorKurt Frank
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Abstract
The invention relates to a method for detecting selection of a pump assembly (25, 32), for instance a fuel pump assembly, in which at least two pump assemblies are provided. By means of a control unit (12), the lambda signal is scanned continuously by means of lambda probes (21). As a function of the lambda signal ascertained, the maximum fuel injection quantity is limited to the supply quantity of a fuel pump assembly (25, 32), and simultaneously a limitation of the air quantity to the air quantity corresponding to the maximum fuel injection quantity is effected. The limitation of the maximum fuel injection quantity and of the associated air quantity is effected via a throttle valve element (13.1), which is triggered by the control unit (12).
Claims10
A method of detecting failure of a pump assembly in a pump module having at least two pump assemblies, the method comprising the steps of continuously scanning a lambda value via lambda probes by a control unit;
- limiting a maximum injection quantity to a supply quantity of a fuel pump assembly;
- simultaneously limiting an associated air quantity to an air quantity corresponding to the maximum fuel injection quantity;
- effecting the limiting of the maximum fuel injection quantity and allowable injection quantity via a throttle valve element.
An engine management system, comprising a control unit for detecting a selection of a fuel pump assembly in a fuel pump module;
- a throttle valve controlled by said control unit via a throttle valve transducer as a function of a lambda signal ascertained by lambda probes;
- and means for effecting at superstoichiometric lambda values, a limitation of a maximum fuel injection quantity and an associated air quantity.
Dependencies are inferred from the claim text.