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A pwm signal filtering method for automotive lighting system

A PWM signal and automotive lighting technology, applied in the field of signal processing, can solve problems such as slow response, interference, and long response time of the controller, and achieve the effects of improving visual effects, improving safety, and high stability

Active Publication Date: 2017-06-23
KEBODA TECH CO LTD
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Problems solved by technology

[0002] At present, cars are becoming more and more popular. Car lights are one of the important structures in cars. Car lights are generally illuminated by the input or output of corresponding signals from the controller. However, in actual work, the signal of the controller is between input and output. It is very easy to receive interference from various signals during the process. In this way, the signal of the controller has low output value accuracy, or the signal of the controller has long response time and slow response, which cannot meet the requirements of the automotive lighting system.

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  • A pwm signal filtering method for automotive lighting system
  • A pwm signal filtering method for automotive lighting system
  • A pwm signal filtering method for automotive lighting system

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Embodiment Construction

[0010] The present invention will be further described below in conjunction with the accompanying drawings.

[0011] The researchers found that for a system with an input-output relationship, ideally when the input signal is stable, there will be a stable output. But there are various interferences in real life, when the signal and noise are superimposed, it is necessary to filter out the noise to obtain a stable output value. The current filtering methods include median filtering, average filtering, threshold filtering, recursive filtering, etc. The general average filtering and recursive filtering cannot meet the occasions with special requirements for response time. For example, for safety reasons, the response time of the car light controller must be less than 50ms, and the digital dimming mode requires that the output brightness deviation does not exceed 1%, and the PWM input signal frequency is 100Hz. When the car light controller samples three PWM input signals with a ...

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Abstract

Disclosed in the invention is a PWM signal filtering method for an automotive illumination system. The automotive illumination system comprises a controller. The controller compares a quantized value AD_in of an input PWM signal sampled currently with a quantized value AD_out1 of an output PWM signal filtered last time. If a relation that | AD_in- AD_out1| is less than or equal to Threshold 1 is met , a current output PWM signal quantized value AD_out is equal to AD_out1; if AD_in minus AD_out1 is larger than Threshold 1, a current output PWM signal quantized value AD_out is equal to a value of AD_in minus Threshold 1. If a relation that AD_out1 minus AD_in is larger than Threshold2, a current output PWM signal quantized value AD_out is equal to a value of AD_in plus Threshold2. The Threshold 1 and the Threshold2 are set threshold values. According to the invention, after filtering, the PWM signal outputted by the controller has high precision and high stability.

Description

technical field [0001] The invention relates to signal processing technology, in particular to a filtering method for PWM signals of an automobile lighting system. Background technique [0002] At present, cars are becoming more and more popular. Car lights are one of the important structures in cars. Car lights are generally illuminated by the input or output of corresponding signals from the controller. However, in actual work, the signal of the controller is between input and output. In the process, it is very easy to receive interference from various signals. In this way, the signal of the controller has low output value accuracy, or the signal of the controller has long response time and slow response, which cannot meet the requirements of the automotive lighting system. Contents of the invention [0003] In view of this, an embodiment of the present invention provides a PWM signal filtering method for an automotive lighting system, the automotive lighting system incl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
Inventor 王庆利
Owner KEBODA TECH CO LTD
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