CN103033483A - Method for measuring surface pollution degree of vehicle lamp - Google Patents

Abstract

The invention discloses a method for measuring the surface pollution degree of a vehicle lamp. A modulation circuit is used for modulating ultraviolet light emitted by a light source; the modulated ultraviolet light is irradiated on a lampshade of the vehicle lamp; the light scattered by the lampshade is received by an ultraviolet light detector which is sensitive to a specific wavelength; the intensity of the light is converted to an electric signal by the ultraviolet light detector; the electric signal is delivered to a processing circuit; and the processing circuit outputs voltage. In the case that the pollution of the lampshade achieves a certain degree, the processing circuit outputs high level so as to start a vehicle lamp cleaner, and after the lampshade is cleaned, the cleaner is automatically switched off. According to the method disclosed by the invention, the surface cleanness of the vehicle lamp can be kept, the unnecessary cleanliness on the lampshade can be reduced, and the service life of the cleaner can be prolonged.

Description

A kind of method of measuring car light surface contamination degree

Technical field

The present invention relates to a kind of method of judging car light lampshade pollution level, relate in particular to a kind of employing light source emitting ultraviolet light irradiation car light lampshade, ultraviolet light detector receiving scattered light to the specific wavelength sensitivity converts electric signal to, judges the method for car light lampshade pollution level according to the size of electric signal.

Background technology

The vehicle light illumination situation is the important factor in order of safety traffic under the condition of night or light difference.The size of car light lampshade pollution level can affect illuminating effect, even causes traffic hazard.In existing vehicle lamp cleaning device and the method, adopt and continue to clean technology or the intermittent startup cleaning device technology of lampshade or manually start the cleaning device technology, lack the method for judging the car light pollution level, can not start cleaning device according to the lampshade actual levels of pollution.Adopt to continue to clean the serviceable life that the lampshade technology can reduce lampshade and washer, in most of the cases there is no need; Adopt intermittent startup cleaning device technology, automatically open cleaning device every one period regular time, when the lampshade pollution level is high, not there is no need, when pollution level is high, possibly can't in time remove the dirt on lampshade surface; Employing manually starts the cleaning device technology, can not guarantee car light in the course of the work lampshade remain cleaning, bring hidden danger.

Therefore, in order to overcome above-mentioned technological deficiency, need a kind of method of judging car light surface contamination degree, so that the startup of control vehicle lamp cleaning device.

Summary of the invention

The invention discloses a kind of method of automatic measurement car light surface contamination degree, the method can be measured car light surface contamination degree, cleans lampshade according to actual conditions, overcomes can not in time clean lampshade or to the technological deficiency of the unnecessary cleaning of lampshade.

The method that the present invention adopts is: modulation circuit is modulated the ultraviolet light intensity that light source sends, modulated ultraviolet lighting is to the car light lampshade, the light that the lampshade scattering is returned is received by the ultraviolet light detector to the specific wavelength sensitivity, ultraviolet light detector changes into electric signal with light intensity, electric signal is delivered to treatment circuit and is processed, the electric signal control headlight cleaner for the treatment of circuit output;

Treatment circuit comprises amplification, frequency-selecting and rectifying and wave-filtering process to the processing procedure of signal.

Only this circuit is just worked in the process of car light work, detects the pollution level of car light lampshade.

During car light work, the car light lampshade can be polluted because of the impact of environment, if with present cleaning car lamp technology lampshade is cleaned, may reduce the serviceable life of lampshade and headlight cleaner or can not in time clean lampshade, at this moment, available said method control headlight cleaner, when the lampshade pollution acquires a certain degree, start headlight cleaner, the method is converted to voltage with the lampshade pollution level, and whether two threshold voltage comparisons of voltage and setting are started headlight cleaner with decision.

The invention has the beneficial effects as follows: a kind of method of measuring the lampshade pollution level is provided, size to the ultraviolet light detector output electrical signals of specific wavelength sensitivity in the method is relevant with the pollution level on car light lampshade surface, and the electric signal for the treatment of circuit output can be used for controlling headlight cleaner.Avoid the unnecessary cleaning to lampshade, prolong the serviceable life of lampshade and headlight cleaner; In time clean lampshade, keep car light cleaning in the course of the work.

By reach the explanation to embodiments of the invention in conjunction with following accompanying drawing, it there is further understanding.

Description of drawings

Fig. 1 is schematic diagram of the present invention.

Fig. 2 is the fundamental diagram of the square wave signal generator of one embodiment of the invention.

Fig. 3 is the fundamental diagram of driver in the modulation circuit among the embodiment.

Fig. 4 is the circuit diagram of MIC833 in the treatment circuit.

Among the figure: 1. modulation circuit, the ultraviolet light of 2. being modulated, 3. car light lampshade, 4. scattered light, 5. to the ultraviolet light detector of specific wavelength sensitivity, 6. electric signal, 7. treatment circuit, 8. headlight cleaner, 9. single chip computer AT 89S51,10. driver DD311,11.MIC833.

Embodiment

With reference to Fig. 1, in the present embodiment, comprise modulation circuit, car light lampshade, the ultraviolet light detector to the specific wavelength sensitivity, treatment circuit and headlight cleaner; Ultraviolet light detector to the specific wavelength sensitivity comprises photodiode and optical filter; Modulation circuit comprises square wave signal generator, led driver and LED lamp; Treatment circuit comprises amplifier, frequency selection network, current rectifying and wave filtering circuit and voltage comparator.

Because of the impact of environment, the lampshade surface can be polluted, and when car light is worked, starts this circuit.

Square wave signal generator produces square-wave signal to the led driver Enable Pin, and the control driver is the square-wave signal of 40KHZ by square wave signal generator being carried out software programming generation frequency, and when the led driver Enable Pin was effective, the LED lamp was luminous.

The optical wavelength that the LED lamp sends is between 375-380nm, and illumination is mapped on the car light lampshade, and the light that the lampshade scattering is returned is received by photodiode behind optical filter filtering interfering light, and the optical filter transparent wavelength range is 370-390nm.

Car light lampshade pollution level is larger, the light that scattering is returned is stronger, photodiode converts the light intensity that receives to electric current, electric current is with the frequency change of square-wave signal, electric current converts voltage to by amplifier, the enlargement factor of resonance-amplifier, make amplifier export sizeable voltage, the voltage of amplifier output is to frequency selection network, and the resonance frequency of frequency selection network is arranged to 40KHZ, the frequency selection network output AC voltage, alternating voltage is to current rectifying and wave filtering circuit, the current rectifying and wave filtering circuit output dc voltage, the size of this voltage is relevant with car light lampshade pollution level, and this voltage is delivered to voltage comparator.

The a certain degree of polluting take lampshade is as foundation, the voltage of current rectifying and wave filtering circuit output this moment as the larger threshold voltage of voltage comparator, when the voltage of current rectifying and wave filtering circuit output during greater than the larger threshold voltage of voltage comparator, voltage comparator output high level starts headlight cleaner; The voltage of current rectifying and wave filtering circuit output is during less than the less threshold voltage of voltage comparator, voltage comparator output low level, closing vehicle lamp washer; The voltage of current rectifying and wave filtering circuit output is between two threshold voltages the time, and it is constant that the voltage of voltage comparator output is kept original value.

When the lampshade pollution level reaches preset value, automatically start headlight cleaner, after cleaning up, the headlight cleaner autoshutdown.

Wherein, the electric current in the photodiode also can be delivered to first frequency selection network, and the alternating current of frequency selection network output is to amplifier,

The alternating voltage of amplifier output is delivered to current rectifying and wave filtering circuit.

Also can use a plurality of amplifiers to be chained together, frequency selection network is placed between two adjacent amplifiers, or be placed on after all amplifiers, or be placed on before all amplifiers.

The single-chip microcomputer model that adopts in the square wave signal generator is AT89S51, driver adopts the DD311 chip, the model of LED lamp is SSL-LXT046375C, the model that optical filter uses is UPG-380, the model that photodiode uses is PR33-2-TO8, and the model that amplifier adopts is LH0032, and frequency selection network adopts the LC shunt-resonant circuit, voltage comparator consists of with MIC833 and four resistance, and current rectifying and wave filtering circuit adopts full-bridge rectification, capacitor filter.Optical filter and photodiode are placed on the position that light that the ultraviolet LED lamp sends can not direct irradiation, and optical filter is placed near the photodiode.

The present invention can make some modifications under the premise of without departing from the spirit of the present invention by those skilled in the art, but the modification of doing is still within the protection domain of the application's claim.

Claims (2)

1. method of measuring car light surface contamination degree, it is characterized in that: modulation circuit is modulated the ultraviolet light intensity that light source sends, modulated ultraviolet lighting is to the car light lampshade, the light that the lampshade scattering is returned is received by the ultraviolet light detector to the specific wavelength sensitivity, ultraviolet light detector changes into electric signal with light intensity, electric signal is delivered to treatment circuit and is processed, the electric signal control headlight cleaner for the treatment of circuit output;

Treatment circuit comprises amplification, frequency-selecting and rectifying and wave-filtering process to the processing procedure of signal.

2. a kind of method of measuring car light surface contamination degree according to claim 1, it is characterized in that: only this circuit is just worked in the process of car light work, detects the pollution level of car light lampshade.

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