Device for sensing the state of an injector
AssigneeLiebherr-Components Deggendorf GmbH
InventorsNorbert Schoefbaenker, Richard Pirkl, Lorand D'Ouvenou
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Abstract
The invention relates to a device for sensing the state of an injector, comprising an injector for injecting fuel into an engine combustion chamber, a switch, which is designed to change the switching state thereof in accordance with the state of the injector, and an evaluating unit for sensing the switching state of the switch, wherein a first switch contact of the switch is connected to an electrical input line of the injector, a second switch contact of the switch is connected to ground, and the evaluating unit is designed to carry out a first current measurement for a current flowing into the injector and into the switch and a second current measurement for the current flowing into the injector.
Claims16
A device for state detection of an injector comprising:
- an injector for injecting fuel into an engine combustion chamber;
- a switch that is adapted to change its switch state in dependence on a state of the injector;
- and
- an evaluation unit for detecting the switch state of the switch, wherein
- a first switch contact of the switch is connected to an electrical input line of the injector;
- and
- a second switch contact of the switch is connected to ground, and
- the evaluation unit is adapted to carry out a first current measurement for a current (IHS, ICT) flowing into the injector and into the switch and a second current measurement for the current (ILS) flowing into the injector.
A method for state detection of an injector for injecting fuel into an engine combustion chamber, the method comprising:
- performing a first current measurement to measure a sum of a current (IHS) flowing into the injector and a current (ICT) flowing into a switch, the switch adapted to change its switch state in dependence on a state of the injector;
- measuring only current (ILS) flowing through the injector by a second current measurement;
- and
- drawing a conclusion on the current (ICT) actually flowing through the switch from a difference of the first current measurement from the second current measurement.
Dependencies are inferred from the claim text.