Engine oil pin position sensor detecting circuit

Abstract

The invention provides an engine oil pin position sensor detecting circuit. Square signals from a controller CPU are converted into two paths of standard same-frequency sine wave signals through a square wave-to-sine wave circuit, and the same-frequency sine wave signals are amplified by a reverse operational amplifier and are respectively output to an oil pin position exciting output unit through two paths of power output amplifiers; sine waves output by an exciting sine wave amplification stage are shaped into three paths of standard same-frequency grounding square signals through a comparator and a shaping circuit, the same-frequency grounding square signals are fed to a sine-wave-to-half-wave unit set of an oil pin position exciting channel, an SIN channel and a COS detecting channel, the lower half circle of the sine waves output by the sine wave amplification stage is turned over to frequency doubling half-wave signals, and the frequency doubling half-wave signals are converted into smooth direct-current voltages by being filtered and shaped by half-wave-to-direct-current voltage unit sets on the three detecting channels; the position of an oil pin is calculated by the electronic controller CPU of an engine according to the trigonometric function relation of AD conversion voltage values, and whether the impedance and phases of an exiting winding, a sine winding and a cosine winding of an external oil pin position sensor are matched or not is judged.

Description

technical field

[0001] The invention relates to a detection circuit applied to the driving of an angular position sensor and angle signal analysis, in particular to a detection circuit suitable for an engine oil needle position sensor. Background technique

[0002] In the control of aero-engines, the fuel metering device generally uses a torque motor or a stepper motor to change the position of the oil needle, thereby controlling the fuel flow. In the aero-engine digital control system, it is mainly used to accurately measure and control the linear / angular displacement of the position of the throttle lever, the position of the oil needle, the position of the guide vane, and the position of the nozzle. At present, the driving and detection technology of the common angular position sensor is realized by AD2S80 and other application-specific integrated circuits. With the improvement of the output accuracy of these integrated circuits, the longer the analysis time is, the worse ...

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