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Anti-interference method for sampling of aircraft electric braking system

An electric brake and aircraft technology, applied in the direction of electrical signal transmission system, signal transmission system, electrical components, etc., can solve the problems of signal delay, system brake error, affecting the normal operation of other electrical equipment, etc., to achieve stable position feedback signal, avoid effect of influence

Active Publication Date: 2014-07-16
东莞市三航军民融合创新研究院
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Problems solved by technology

The ASD system generally adopts the voltage pulse width modulation (PWM, Pulse Width Modulated) control method. PWM control improves the motor drive performance, but it becomes the main source of conducted and radiated electromagnetic interference. Using this control method will cause Generate dv/dt pulse wave above 6kV/μs, which will cause great interference to surrounding circuits
Among them, conduction interference may affect the normal operation of other electrical equipment, while radiation interference will cause malfunction and failure of equipment around the interference source
[0005] The given braking command and position feedback signal in the all-electric braking system are the key signals in the system control, which are easily disturbed. If the AD sampling detects the interference point of the given command or feedback signal, the system will brake by mistake, and the braking system The actuating distance is very small, and accidental braking will cause serious consequences such as mechanism jamming or mechanism damage
However, the interference signal superi

Method used

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  • Anti-interference method for sampling of aircraft electric braking system
  • Anti-interference method for sampling of aircraft electric braking system
  • Anti-interference method for sampling of aircraft electric braking system

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[0030] The present invention will now be further described in conjunction with the embodiments and drawings:

[0031] Due to the extremely large dv / dt value, the interference of the measured signal mainly occurs at the edge position of the PWM wave, such as figure 1 As shown, if no measures are taken, the interference point is very likely to be picked up, causing false braking. The method adopted here is to place the AD sampling point as far as possible from the PWM edge. When the PWM duty cycle is less than 50%, place the AD sampling period in the middle of the high level part of the PWM wave, such as figure 2 As shown, when the PWM duty cycle is greater than 50%, the sampling period of AD is placed in the middle of the low level part of the PWM wave, such as image 3 Shown.

[0032] The specific implementation process uses TI’s TMS320F2812 as the main control chip:

[0033] Step 1: First set the compare interrupt to start the ADC, clear the count register T1CNT in the main control...

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Abstract

The invention relates to an anti-interference method for sampling of an aircraft electric braking system. Because of an infinite dv/dt value, interference of a measured signal mainly happens at the edges of PWM waves, it no measure is taken, an interference point is very likely to be acquired, and error braking is caused. According to the method, an AD sampling point is placed in the position away from the PWM edges as much as possible, when the PWM duty ratio is smaller than 50 percent, the AD sampling period is located in the middle of a high level of the PWM waves, and as is shown in the second graph, when the PWM duty ratio is larger than 50 percent, the AD sampling period is located in the middle of a low level of the PWM waves.

Description

technical field [0001] The invention belongs to a data sampling method of an aircraft electric brake, relates to an anti-interference processing of aircraft electric brake data, in particular to an aircraft electric brake system sampling anti-interference method. Background technique [0002] The aircraft braking system is a subsystem with relatively independent functions on the aircraft. Its function is to absorb the kinetic energy of the aircraft during landing and taxiing, so as to make the aircraft brake quickly. The all-electric braking system is to use the electronic drive device to drive the brake actuator, and use the electronic transmission line to replace the original oil pipeline to realize the braking and control functions of the brake. [0003] The aircraft all-electric braking system has better safety, reliability, maintainability and potentially better braking performance, which can greatly reduce the weight of the system. However, it also brings many problem...

Claims

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Application Information

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IPC IPC(8): H03M1/54
Inventor 马瑞卿相里康张庆超韩伟健刘青
Owner 东莞市三航军民融合创新研究院
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