Aircraft engine rotating speed signal acquisition circuit

An aero-engine and rotational speed signal technology, applied in linear/angular velocity measurement, velocity/acceleration/shock measurement, measuring devices, etc., can solve problems such as poor interference ability, achieve the effect of suppressing interference and improving anti-interference ability

Inactive Publication Date: 2015-02-04
SHAANXI QIANSHAN AVIONICS
View PDF6 Cites 19 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: To provide a frequency signal acquisition circuit for an adaptive threshold of aero-engine speed, which can overcome the defects of fixed comparison threshold and poor interference suppression ability in traditional engine speed signal acquisition circuits

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Aircraft engine rotating speed signal acquisition circuit
  • Aircraft engine rotating speed signal acquisition circuit
  • Aircraft engine rotating speed signal acquisition circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] Below in conjunction with accompanying drawing, the present invention is described in further detail, refer to Figure 3 to Figure 4 .

[0017] refer to image 3 , The engine speed signal acquisition circuit is composed of a voltage clamp circuit 1, a filter circuit 2, a threshold generation circuit 3, a comparison circuit 4 and a digital shaping circuit 5. The clamping circuit consists of a Zener diode, which is used to protect the comparator circuit at the back end, and is connected to the positive terminal of the comparator. The filter circuit is composed of an isolation resistor and a capacitor connected to the positive terminal of the comparator. The filter circuit constitutes a low-pass filter, which can effectively remove high-frequency clutter. The threshold generation circuit is mainly composed of resistors, operational amplifiers and RMS converters, which are used to generate comparison thresholds. The comparison circuit is composed of a comparator and a fe...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention belongs to electronic technology, is applied to the technical field of aviation electronics, and particularly relates to a frequency signal acquisition circuit with an adaptive threshold. The acquisition circuit comprises a clamping circuit, a filtering circuit, a comparison circuit, a threshold generation circuit and a digital shaping circuit, one branch of an inputted engine rotating speed signal of an input is insulated and clamped and then connected to a negative input end of the comparison circuit, the other branch is connected on the threshold generation circuit, and an output of the threshold generation circuit is connected at a positive input end of the comparison circuit. The acquisition circuit has the advantages that an acquisition circuit of a traditional engine rotating speed signal acquires, restrains and interferes signals through a hysteresis comparator, and the acquisition circuit solves the problems of fixed threshold of the acquisition circuit of the traditional engine rotating speed signal and poor interference resistance. The acquisition circuit can automatically change a comparison threshold of the hysteresis comparator according to change of an amplitude of the engine rotating speed signal of the input, and the interference resistance of an interface circuit is improved.

Description

technical field [0001] The invention belongs to the category of electronic technology and is applied in the technical field of avionics, in particular, it relates to a frequency signal acquisition circuit with an adaptive threshold. Background technique [0002] The airborne speed signal acquisition circuit is mainly used to collect the engine speed of the aircraft. The engine speed signal acquisition circuit mainly adjusts the engine speed signal into a standard pulse signal through resistors, capacitors, comparators, optocouplers and other devices for the controller to collect. The circuit principle is simple. However, the environment on the aircraft is complex, and various interference signals are often inserted into the normal engine signal, and the amplitude of the interference signal often increases with the increase of the engine speed. [0003] The traditional engine speed signal acquisition circuit, such as figure 1 Among them, a conditioning circuit composed of c...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G01P3/481
Inventor 刘安章
Owner SHAANXI QIANSHAN AVIONICS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap