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Locomotive speed detection signal filtering method

A technology of signal filtering and speed detection, applied in signal transmission systems, instruments, etc., to achieve the effect of eliminating rising edge jitter and falling edge jitter

Active Publication Date: 2019-05-07
XIANGTAN ELECTRIC LOCOMOTIVE FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems existing in the existing locomotive speed detection signal, the present invention provides a locomotive speed detection signal filtering method, which is realized by a locomotive speed sensor signal filtering device including a fast discharge circuit, a fast charge circuit, a capacitor, and a Schmidt circuit

Method used

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  • Locomotive speed detection signal filtering method

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Embodiment 5

[0048] In embodiment 5, the fast discharge circuit and the fast charge circuit share a charge and discharge resistor, that is, the charge resistor and the discharge resistor connected in parallel with the fast discharge diode and the fast charge diode respectively are cancelled, and are all connected in parallel at the input pulse terminal E1 and the Schmidt The charging and discharging resistor R51 of the circuit input terminal E2 is replaced. This circuit is a special case where the charging resistor and the discharging resistor are the same, which can simplify the circuit structure.

[0049] Figure 8 Shown is Embodiment 6 of the locomotive speed sensor signal filtering device. In Embodiment 6, the fast discharge diode is a diode D61, the fast charge diode is a diode D62, the fast discharge switch and the fast charge switch are digitally controlled multi-channel analog switches T61; the capacitor is a capacitor C61, and one end of the capacitor C61 is connected to a Schmit...

Embodiment 6

[0050] In embodiment 6, the fast discharge circuit and the fast charge circuit share a charge and discharge resistor, that is, the charge resistor and the discharge resistor connected in parallel with the fast discharge diode and the fast charge diode respectively are cancelled, and are all connected in parallel at the input pulse terminal F4 and Schmidt The charging and discharging resistor R61 of the circuit input terminal F2 is replaced. This circuit is also a special case where the charging resistor and the discharging resistor are the same, which can simplify the circuit structure.

[0051] The input signal of the Schmidt circuit is the voltage on the capacitor, therefore, the Schmidt circuit is required to have a high input impedance characteristic. Schmitt circuit can choose CMOS Schmitt inverter CD40106, 74HC14 with high input impedance characteristics, or choose CMOS Schmitt NAND gate CD4093, 74HC24 and other devices with high input impedance characteristics. The upp...

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Abstract

The invention relates to a locomotive speed detection signal filtering method, which is implemented by a locomotive speed sensor signal filtering device comprising a fast discharging circuit, a fast charging circuit, a capacitor and a Schmitt circuit. The magnitude of the level of an output pulse controls an input pulse to charge and discharge the capacitor through one of the fast discharging circuit and the fast charging circuit, and the output pulse is obtained by shaping the voltage on the capacitor through the Schmitt circuit. By adopting the locomotive speed detection signal filtering method, the positive narrow pulse interference during the negative wide pulse and the negative narrow pulse interference during the positive wide pulse can be automatically filtered, and especially continuous narrow pulse interference signals can be filtered; the maximum widths of the positive narrow pulse and the negative narrow pulse that need to be filtered can be adjusted by changing the chargingtime constant and the discharging time constant respectively; and the method can be applied to occasions of locomotive speed detection or traction motor speed detection.

Description

[0001] The patent application of the present invention is a divisional application, the original application number is 201610421277.0, the application date is June 15, 2016, and the invention name is the locomotive speed sensor signal filtering device. technical field [0002] The invention relates to a sensor detection device for a rail transit vehicle, in particular to a method for filtering a locomotive speed detection signal. Background technique [0003] The commonly used method for detecting the speed of the traction motor of a locomotive is to install a speed measuring gear on the small gear of the traction motor. There is a gap between the speed measuring gear and the speed sensor. An alternating frequency signal proportional to the wheel speed is generated. The shaft of the traction motor is connected to the wheel through the pinion gear and the bull gear. The sensor outputs a certain number of pulses every time the wheel rotates, so the frequency of the induced alt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08C25/00
CPCG08C25/00
Inventor 肖会芹凌云曾红兵
Owner XIANGTAN ELECTRIC LOCOMOTIVE FACTORY
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