Device for detecting the onset of fuel injection
AssigneeRobert Bosch GmbH
InventorsGerhard Engel, Wessel, Wolf
Life of this patent
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Abstract
A signal transducer for use in association with a fuel injection valve of an internal combustion engine to detect the moment of commencement of fuel injection. The axial position of the fuel valve needle is sensed and a proportional signal is applied to a signal differentiator which generates therefrom an output signal with a substantially steeper initial slope. This signal is easier to evaluate with respect to the onset of fuel injection than the direct transducer signal which has relatively low absolute amplitudes and whose amplitude increases only very slowly at the moment of opening of the injection valve.
Claims9
A device for detecting the onset of fuel injection in a fuel injection valve of an internal combustion engine including:
- a mechanical-electrical transducer associated with said fuel injection valve for generating a first output signal related to the position of the movable valve member in said fuel injection valve, and an electronic processing circuit for processing said signal generated by said transducer, and wherein the improvement comprises a differential circuit connected to said transducer for directly receiving the signal from said transducer and generating therefrom a differentiated signal to be applied to said processing circuit.
A device for detecting the onset of fuel injection in a fuel injection valve of an internal combustion engine including:
- a mechanical-electrical transducer associated with said fuel injection valve for generating a first output signal related to the position of the movable valve member in said fuel injection valve, and an electronic processing circuit for processing said signal generated by said transducer, and wherein the improvement comprises a differential circuit connected to said transducer for receiving the signal from said transducer and generating therefrom a differentiated signal to be applied to said processing circuit, further comprising a holding circuit for receiving the output of said differentiating circuit.
A device for detecting the onset of fuel injection in a fuel injection valve of an internal combustion engine including:
- a mechanical-electrical transducer associated with said fuel injection valve for generating a first output signal related to the position of the movable valve member in said fuel injection valve, and an electronic processing circuit for processing said signal generated by said transducer, and wherein the improvement comprises a differentiated circuit connected to said transducer for receiving the signal from said transducer and generating therefrom a differentiated signal to be applied to said processing circuit, wherein said processing circuit includes a threshold switch for receiving the output signal from said differentiating circuit.
Dependencies are inferred from the claim text.