Circuit arrangement for evaluating the electrical output signals of a detector for thickness changes in a fuel injection line
AssigneeSiemens Aktiengesellschaft
InventorAlbert Maringer
Life of this patent
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Abstract
A circuit arrangement for evaluating the electrical output signals of a detector for thickness changes in a fuel injection line under the influence of an injection process comprising a series circuit connected to output terminals of the detector and including a differential amplifier, an a-c voltage amplifier, a highpass filter and a rectifier with a peak value storage device and a Schmitt trigger each connected in parallel to the output of the rectifier, the output of the peak value storage device being connected as a reference input of the Schmitt trigger, and a one shot multivibrator connected to the output of the Schmitt trigger.
Claims4
Apparatus for evaluating the electrical output signals of a detector for thickness changes in a fuel injection line due to the influence of the injection process, such as the rapid pressure variations generated when an injection valve is closed, comprising:
- a. the series connection of an a-c voltage amplifier responsive to said detected signals at its input, a highpass filter and a rectifier responsive to said a-c voltage output;
- b. a peak value storage device having the output of said rectifier as its input;
- c. a Schmitt trigger, also having as its input the output of said rectifier, the output of said peak value storage device being connected as a reference input to the Schmitt trigger;
- and
- d. a one shot multivibrator connected to the output of said Schmitt trigger.
Dependencies are inferred from the claim text.