CN1440894A

CN1440894A - Automatic vehicle light controller

Info

Publication number: CN1440894A
Application number: CN 02106329
Authority: CN
Inventors: 谢志勇
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-02-24
Filing date: 2002-02-24
Publication date: 2003-09-10

Abstract

The automatic vehicle light controller for controlling headlight of vehicle consists of lighting sensor and vehicle light controller. The lighting sensor includes photosensitive element A to sense the light in front of the vehicle, photosensitive element B to sense the light from other directions, signal amplifiers following the photosensitive elements to raise the electromagnetic interference resisting capability, and light hoods to cover the photosensive elements to raise the stray light resistance. The vehicle light controller consists of measuring and comparing logic control circuit and vehicle light controlling switch, the measuring and comparing logic control circuit consists of A/D converter, digital comparator circuit and relay control circuit.

Description

Automatic vehicle light controller

Car light is prerequisite a kind of important device in our the present vehicle that use, and it provides illumination to us when being necessary.But present car light is almost all by manually control of chaufeur, especially need frequent control car light during nighttime meeting, this has brought certain work load to chaufeur, simultaneously, also may cause certain adverse effect because of the work carelessness of chaufeur.The purpose of this device is exactly the control automation that will make car light, alleviates the operation pressure of chaufeur, reduces to control the trouble that error brings because of car light, keeps the manual control of chaufeur to car light again simultaneously, makes conventional operation unaffected.

This device mainly is made up of two parts, and the one, optical sensor, the 2nd, Lighting Controller (seeing accompanying drawing one).(accompanying drawing two is other forms of optical sensor part)

Two photosensor A and B are arranged in optical sensor, being subjected to of this two photosensors exists certain included angle θ between light direction, what each photosensor respectively carried its axis and cooresponding photosensor is subjected to light direction consistent shading sleeve AT and BT, the shading sleeve effect is to strengthen the phtotoactive directivity of photosensor, to improve the antijamming capability of optical sensor to veiling glare.The light direction that is subjected to of photosensor A is the place ahead of vehicle, its effect is the light intensity of impression from vehicle front, the light direction that is subjected to of photosensor B is other directions that can avoid vehicle front light, and its effect is the ambient light intensity of impression except vehicle front.The design-calculated purpose is that the surround lighting of vehicle front light and vehicle's surroundings is surveyed by different photosensors respectively like this, two kinds of different Illumination intensity that Lighting Controller can be sent here according to optical sensor, judge the residing ambient conditions of vehicle accurately, make car light control command accurately.Certainly, in order to reach this purpose, optical sensor also can be used the design plan shown in figure two.

Figure two is another kind of frame modes of optical sensor, do not required certain included angle θ between the axis of photosensor A and B sensitization direction, but add a reflector in the front of photosensor B, it blocks the coming light of the place ahead and incites somebody to action reflection of ambient light all around to photosensor B, reaches the purpose of coming the surround lighting of light and vehicle's surroundings to be surveyed by different photosensors respectively vehicle front.Can come detection vehicle the place ahead to come light this moment with photosensor A, comes detection vehicle surround lighting all around with the photosensor B that is with reflector.Also can use conversely, photosensor A is used for the environment of detection vehicle and comes light, and the photosensor B of band reflector is used for the place ahead of detection vehicle and comes light, reaches identical purpose.

Electromagnetic pulse signal in the car is stronger, and it can produce electric signal in the optical sensor and disturb.For disturbance rejection, must shorten the on line distance between photosensor and signal amplifier as much as possible, therefore signal amplifier can be made in the shell of optical sensor, photosensor directly is welded on the input circuit of signal amplifier, the photosignal that photosensor is experienced is directly given Lighting Controller by the mouth of signal amplifier after amplifying, so just can improve the antijamming capability of optical sensor greatly, improve the reliability of this controller.

Lighting Controller is made up of than logic determines control circuit C and car lamp control switch amount, and wherein measuring than logic determines control circuit C has two input end Ina and Inb and control the mouth Outa and the Outb of passing light and country beam respectively.Mouth Outa and Outb control two car light control relay D and E by control relay circuit respectively, these two relays are exactly car lamp control switch, the switch terminals of its repeat circuit D is in parallel with the main furnace building light switch of vehicle, the passing light switch in parallel of the switch terminals of relay E and vehicle, thereby control the whole headlight of vehicle, because what adopt is parallel way, therefore kept the manual control of chaufeur to car light, the access of this controller make conventional operation unaffected, so can not influence the original controllable function of car light.Two input end Ina and Inb respectively with optical sensor in photosensor A and photosensor B after the mouth of signal amplifier link to each other, the amount of making can read the various ambient lighting intensity that optical sensor is sent here than logic determines control circuit, it is analyzed comparison, make corresponding car light control command.

Amount is made up of analog to digital conversion circuit, computer numeral comparator circuit and control relay circuit than logic determines control circuit, the sensitive volume electric signal that analog to digital conversion circuit transmits optical sensor sends the computer numeral comparator circuit to after converting digital signal to, make it can read the size of the amount of input end incoming signal, it can compare the size of incoming signal amount simultaneously, makes the closed and disconnected of control relay circuit control relay D and E according to its different comparative result.The computer numeral comparator circuit amount of being is than the heart of logic determines control circuit, it can be formed with micro controller system or other digital circuit, can programme in this computer numeral comparator circuit, the various functions of the required realization of Lighting Controller can here be achieved by programming.

Descending in the open by day, photosensor A and photosensor B all can experience stronger illumination, therefore, amount all is that strong input-signal judging goes out the situation that vehicle is in daytime than logic determines control circuit C according to two, do not need to open car light, thereby relay D and relay E are disconnected, and the control car light cuts out.

Vehicle ' was when the urban district on that night, owing on the road of this moment street lighting is arranged, photosensor B will experience more weak but not be very weak ambient lighting intensity, according to such Illumination intensity, Lighting Controller will be judged vehicle ' in the urban road, no matter how many Illumination intensity of the vehicle front that photosensor A experiences is, Lighting Controller all will be opened passing light and close country beam.

Vehicle ' was when long-distance highway on that night, owing to there is not street lighting, photosensor B will experience very weak ambient lighting intensity, and what photosensor A experienced is the reflected light and the vehicle front lighting at a distance of the vehicle light illumination of self, and its Illumination intensity approaches very weak.According to these two very weak Illumination intensity, amount can judge on the long-distance highway that vehicle is in night than logic determines control circuit and the front does not have the meeting situation, thereby allows relay D closure, and relay E disconnects, and opens country beam, closes passing light.

When vehicle during at nighttime meeting, what photosensor A experienced is the direct light of front vehicles headlight, and its Illumination intensity is stronger.Photosensor B still only experiences the ambient lighting of vehicle owing to can avoid the direct light of front vehicles headlight, its Illumination intensity still a little less than.According to this stronger more weak Illumination intensity is compared, amount can be judged vehicle than logic determines control circuit and be in the nighttime meeting state, thereby allows relay D disconnect, and relay E closure is closed country beam, opens passing light.If when meeting, front vehicles is ignored traffic law and is still being opened country beam, and photosensor A will experience very strong Illumination intensity.According to the comparison to this very strong more weak Illumination intensity, amount can judge and control country beam of flicker than logic determines control circuit, reminds the other side to observe traffic rules and regulations.

Before vehicle enters the tunnel by day, the vehicle front light that photosensor A experiences weakens, photosensor B can also feel that the ambient lighting of vehicle-surroundings is more intense, therefore, amount than logic determines control circuit C according to A a little less than the strong input-signal judging of B go out vehicle and be about to enter one and be dark environment, thereby make relay E closure, open passing light.After vehicle sails the tunnel into, be equivalent to night running, Lighting Controller is by night status control car light.Again be in the down open-air of daytime after vehicle sails out of the tunnel, Lighting Controller is again with closing vehicle lamp.

Claims

1. the optical sensor in this device is made up of photosensor A and B with directivity, and wherein the sensitization direction of photosensor A is the place ahead of vehicle, and the sensitization direction of photosensor B is other direction except that vehicle front.For guaranteeing that photosensor A and B can survey the light source of different directions separately, can realize with following two kinds of different schemes respectively:

A: an angle theta is arranged between the axis of the sensitization direction of photosensor A and B, and this angle theta can guarantee that photosensor B can avoid the light on the sensitization direction of photosensor A substantially, makes photosensor A and B experience the light of different directions respectively.

B: before photosensor B, add the light that comes that a reflector blocks its place ahead, the light that comes with its back reflexes on the photosensor B simultaneously, or conversely with the optical sensor direction, before photosensor A, add the environment that a reflector blocks vehicle and come light, the light that comes with vehicle front reflexes on the photosensor A simultaneously, makes photosensor A and B experience the light of different directions respectively.

2. the photosensor in the optical sensor overlaps directivity and the anti-veiling glare interference performance that strengthens this sensor in each comfortable shading sleeve.

3. in the shell of optical sensor signal amplifier is housed, photosensor directly is welded on the anti-electromagnetic interference capability that strengthens optical sensor on the signal amplifier input end.

4. lamp dimmer is made up of than logic control circuit and car lamp control switch amount, and amount is made up of analog to digital conversion circuit, computer numeral comparator circuit and control relay circuit than logic control circuit.Various function of the present invention can be programmed in the computer numeral comparator circuit and be realized.

5. the switch terminals of lamp dimmer repeat circuit D and E is in parallel with the hand control switch of original country beam of vehicle and passing light respectively.