CN1124214A - Auto light changing device for vehicle meeting - Google Patents

Abstract

When two vehicles installed with the invented device meet at night, it can make the two vehicles automatically dimminish in the predetermined distance and the head light will be recovered after meeting. Under the presupposition that while self aspect has been dimminished, it possesses of the ability to force the opposite aspect to dimminish the light. The light gradual change circuit makes the light change gradually while dimminishing to prevent that the substance on road surface will be disappeared in vision for a short duration. Said invention is composed of light receiving and discrimination circuit, state self locking circuit, instruction signal generating and control circuit, light gradual change and output circuit, automatic resumption circuit and manual forced circuit.

Description

Auto light changing device for vehicle meeting

One: the invention belongs to the vehicular electrical appliance technical field.At present, the vehicle of night running is when meeting, and the variation of its light is by operation manually.Known to me, also there is not auto light changing device for vehicle meeting to come out at present in the world, on all kinds of academic journals and technical journal, introducing article and similarly conceiving of this class Dim Dimmer do not appear yet.

Two: purpose of the present invention:

1: during nighttime meeting, the road lighting lamp of both sides' vehicle can require and automatic beam change according to meeting, and meeting finishes and can restore to the original state automatically.

2: during meeting, both sides' vehicle becomes under the prerequisite of light automatically or manually at oneself, and the ability of forcing to realize the other side's automatic beam change is all arranged.

3: the situation of light sudden change when changing meeting, light gradual change circuit is set, prevent the visually of short duration disappearance of road surface object.

Three: the summary of the invention explanation:

1: the automatic beam change design:

When being housed, two cars of the present invention travel with distance light and during intersection at night, in predetermined distance range, the optical signal that always has a car to receive at first reaches preset strength, and this car promptly sends from trend the other side in the flash of light mode and becomes the light instruction, oneself becomes dipped beam subsequently automatically and travels; The other side's vehicle becomes dipped beam at once automatically and travels after receiving and becoming the light instruction.After becoming dipped beam and travelling, both sides' passing light is deepening gradually all, is fixed up after predetermined brightness.Meeting finishes the illumination condition before back both sides' vehicle recovers meeting automatically.

2: circuit formula explanation: (as shown in Figure 1)

The present invention by: six parts such as optical signal reception and discriminator circuit, state latching circuit, command signal generation and control circuit thereof, light gradual change and output circuit, automatic restoring circuit, artificial lock-on circuit are formed.

After optical signal receives and discriminator circuit receives optical signal in predetermined distance range, through amplitude differentiate, the feature of signal differentiates, be confirmed to be the light of the other side's vehicle after, promptly output control signals to the state latching circuit, make its self-locking.If direct current signal then outputs a control signal to command signal simultaneously and produces and control circuit, make it produce a string commanding impulse, output circuit is sent in this pulse, makes car light send a string change light instruction with the flash of light form to the other side's vehicle.Subsequently, because the state latching circuit is in self-locking state, its control light gradual change and output circuit makes vehicle become dipped beam and travels, and light is fixed up after being darkened to predetermined luminance gradually.If what receive is alternating signal (the change light command signal that the other side sends), then do not produce command signal, under the effect of state latching circuit, vehicle directly becomes dipped beam and travels, and light is fixed up after being darkened to predetermined luminance equally gradually.When meeting finished, receiving unit lost the illumination of the other side's vehicle suddenly, and this signal send automatic restoring circuit, after automatic restoring circuit is differentiated through amplitude, the output release signal produces state latching circuit and command signal and control circuit restores, and both sides' vehicle recovers the illumination condition before the meeting.

Have only after the self-locking of state latching circuit, again through suitable time-delay, automatic restoring circuit just enters the warming-up exercise state.

In order to adapt to the meeting requirement under the particular surroundings, artificial lock-on circuit is set, its effect is:

＜1〉available buttons replaces automatic restoring circuit output release signal.

＜2〉in the Vehicle during Crossing Event, manually or under the prerequisite of automatic beam change, available buttons (with using same button in article one) sends mandatory change light instruction to the other side one's own side, control and realize that the other side becomes light.

＜3〉far and near light select switch is set.When the artificial selection dipped beam travelled, the country beam locking did not work, and was not subjected to the control of any extraneous signal, when guaranteeing vehicle meeting that two dipped beams travel, did not produce the distance light flicker.

3: circuit theory explanation (seeing shown in the accompanying drawing 2)

＜1〉optical signal receives and discriminator circuit:

After receiving optical signal and be converted to electric signal by highly sensitive photo-transistor BL, through C ₂, R ₂, R ₃The alternating signal of forming promotes circuit and sends into voltage comparator N ₁Negative input end, (purpose that alternating signal promotes circuit is set, and is the amplitude that improves the command signal that the other side sends relatively, to guarantee normally carrying out of automatic beam change) is by N ₁Finish the task that amplitude is differentiated.RP ₃For predeterminated voltage is regulated.When sending into N ₁Signal voltage when being lower than predeterminated voltage, N ₁Mouth becomes high potential at once.Aerotron VD ₁Play temperature compensation function, mainly utilize its value to become approximate linear change with temperature, the temperature that compensates BL is waftd.RP ₁Be VD ₁The quiescent current RgR, change the slope that quiescent current can be regulated the ＂ Ic-temperature ＂ characteristic line of this aerotron, RP ₂For offset voltage is regulated.Work as N ₁During the output high potential, optical signal shows light-emitting diode HL ₁Bright.

If that BL receives is the optical signal that continues, then N ₁Mouth is kept high potential with signal, and through R ₈To C ₆Charging, reach certain voltage after, the one tunnel makes voltage comparator N ₅Move, go the generation of control command signal; Another road is through voltage comparator N ₂After the amplitude discrimination paraphase, make the self-locking of state latching circuit.

If what BL received is flashing signal, N ₁The mouth current potential is height alternation state, and through C ₄, V ₂To C ₅The charging, reach certain voltage after, the one tunnel makes voltage comparator N ₇Action stops the generation of command signal; Another road is through N ₂After the amplitude discrimination paraphase, make the self-locking of state latching circuit.

Cond C ₄It is blocking condenser; Diode V ₃Play the alternating current discharge effect, make C ₆Under the alternating signal effect, remain active potential.C ₆Choosing of time constant should guarantee that the short signal of individual pulse and time length does not cause N ₂And N ₅The mouth potential change be advisable; C ₅Choosing of charging time constant with the effect of about 3 continuous impulses, can make C ₅Voltage causes N ₂And N ₇The mouth potential change be advisable.So both make circuit finish intended function, strengthened antijamming capability again.

＜2〉state latching circuit:

This circuit is by voltage comparator N ₃With aerotron VD ₂And their peripheral cell is formed.Vehicle at night is during with the distance light cruising, N ₂Mouth is high potential (being in vacant state), at this moment N ₃The negative input end current potential is by R ₁₂And R ₁₃Partial pressure value decision, design makes it be higher than N ₃Positive input terminal current potential, then N ₃Mouth is an active potential, VD ₂End, its emitter-base bandgap grading is output as active potential.During meeting, when the illumination signal makes N ₂When mouth becomes active potential, voltage comparator N ₃Mouth becomes high potential at once, and passes through R ₁₆Carry out voltage positive feedback, make its positive input terminal current potential be higher than R ₁₂With R ₁₃Partial pressure value, i.e. N no matter after this ₂How the mouth current potential changes, N ₃Mouth remains high potential, and by emitter-follower VD ₂All the time export high potential.Realized the function of self-locking.After meeting finished, automatic restoring circuit passed through V ₁₂Make N ₃Positive input terminal becomes active potential, and the release at once of this latching circuit restores to the original state.C ₇Setting be in when start, N ₃Can definitely keep the virgin state of being scheduled to.

＜3〉command signal produces and control circuit:

Instruction signal generating circuit is by voltage comparator N ₈And peripheral cell is formed VD ₇Be its delivery pipe.Work as N ₅, N ₆Mouth all becomes high potential, and makes diode V respectively ₁₆, V ₁₇When ending, N ₈The positive input terminal current potential is higher than negative terminal, and mouth becomes high potential, and passes through R ₄₄Voltage positive feedback the positive input terminal current potential is further improved, pass through R simultaneously ₄₅To C ₁₃Charging.When charging valtage is higher than the positive input terminal current potential, N ₈Mouth becomes active potential at once, and passes through R ₄₄The positive input terminal current potential is reduced, simultaneously C ₁₃Pass through V ₂₁, R ₄₆With the fast speed discharge, work as C ₁₃Current potential is lower than N ₈During the positive input terminal current potential, N ₈Mouth becomes high potential again.So go round and begin again, produce continuous square wave output.Change R ₄₅, R ₄₆Numerical value can change frequency and dutycycle.

The command signal control circuit is by voltage comparator N ₅, N ₆, N ₇And peripheral cell is formed.N ₅And N ₆Form direct current starting of oscillation, time-delay failure of oscillation circuit, when acceptor circuit receives continuous light and makes C ₆Current potential is higher than N ₅During the negative input end current potential, N ₅Mouth becomes high potential, V at once ₁₆End, make instruction signal generating circuit vibration (this moment V ₁₇Be off condition); Simultaneously through R ₃₄, V ₁₄To C ₁₁Charging.Work as C ₁₁Current potential is higher than N ₆During the positive input terminal current potential, N ₆Mouth becomes active potential, V ₁₇Conducting, the instruction signal generating circuit failure of oscillation.Voltage comparator N ₇And peripheral cell form to exchange and to refuse the circuit that shakes, and becomes the light command signal and makes C when acceptor circuit receives ₅Current potential is higher than N ₇During the negative input end current potential, N ₇Mouth becomes high potential at once, and through V ₁₉To C ₁₁Fast charge makes V ₁₇Conducting makes instruction signal generating circuit can not produce vibration.After promptly receiving change light command signal, car light can not glisten; And after receiving the continuous light signal, car light can send a string change light command signal.

＜4〉light gradual change and output circuit:

Output circuit is by VD ₄, VD ₆, VD ₁₀, VD ₁₁, VD ₁₂, VD ₁₃And their peripheral cell is formed.Night is during cruising, because state latching circuit output active potential, so VD ₄End VD ₁₀, VD ₁₂Collecting electrode in no current flow through, so passing light EL ₁Do not work.This moment V ₇End, so VD ₆, VD ₁₁Conducting, VD ₁₃Saturation conduction, country beam EL ₂Bright.When state latching circuit output high potential, and make VD ₄During conducting, cause that above-mentioned device electric state changes, so passing light is bright, country beam extinguishes.

Light gradual change circuit is by VD ₃And peripheral cell is formed.During this circuit energized, for VD ₄End, power supply can pass through VD ₁₂And VD ₁₀Emitter-base diode, RT, R ₂₂, R ₂₁And V ₆To C ₉Charging makes C during cruising at night ₉High potential just very.Work as VD ₄During conducting, C ₉Pass through VD ₃Emitter-base diode and R ₂₁Discharge, discharge current reduces gradually, causes VD ₁₂Collector current reduces gradually, passing light EL ₁Deepening gradually.Because R ₂₂With being arranged among the RT, a default fixed current has EL ₁Can in default brightness, be fixed up at last, finish until meeting.Change R ₂₂Can adjust default brightness, RT is a thermo-compensator, default brightness is lacked become with temperature; Change R ₂₁Can select C ₉Discharge time often imitate.HL ₂Be dichromatic LED, it divides the mode of operation that shows country beam, passing light in addition.VD ₁₂, VD ₁₃Selecting the PNP pipe for use is in order to install on used car when of the present invention, needn't to change original circuit.

＜5〉automatic restoring circuit:

Automatic restoring circuit is by voltage comparator N ₄And peripheral cell is formed.V ₁₀, C ₁₄, R ₃₀, V ₁₁Form lockout circuit Deng element.Night is during cruising, state latching circuit N ₃Mouth is an active potential, makes V ₁₁, V ₁₀Conducting makes C ₁₀Be active potential, so N ₄Mouth is a high potential.During meeting, work as N ₃Self-locking and when making mouth be high potential, promptly pass through R ₃₀To C ₁₄Charging makes V through about 2 seconds ₁₀End, just removed locking this moment automatic recovery.After this when meeting finished, owing to lose the illumination of the other side's vehicle, the BL output voltage improved, and through R ₂₉, C ₁₀After doing time-delay of short duration, make N ₄The negative input end current potential is higher than the preset voltage of positive input terminal, N ₄Mouth becomes active potential at once, and passes through V ₁₂, V ₁₃Make the state before relevant circuit recovers meeting.RP ₄Regulate for recovering preset voltage.The effect of lockout circuit is in this circuit: in the normal Vehicle during Crossing Event, when the other side's vehicle is become dipped beam suddenly and is travelled by distance light, for this moment spacing still far away, a little less than the illumination, prevent the automatic restoring circuit misoperation.

＜6〉artificial lock-on circuit:

This circuit is by button switch SB, switch S A ₁, aerotron VD ₅And peripheral cell is formed.When meeting finishes, press the effect that SB can replace automatic restoring circuit, make V ₁₂, V ₁₃Negative terminal is an active potential, causes the state before relevant circuit and light recover meeting.In the Vehicle during Crossing Event, under the effect of the other side's distance light, when one's own side has become dipped beam and travels, whenever press SB once, can send a string change light command signal to the other side.

SA ₁It is the instant and near light select switch.When toggling it to the dipped beam traveling-position, SA _1-1Conducting make aerotron VD ₅Conducting, it makes VD again ₁₀, VD ₁₂Conducting, passing light EL ₁Bright.While SA _1-2Conducting make positive source through C ₁₂, V ₁₅To C ₁₁Fast charge makes N very soon ₆Mouth becomes active potential, V ₈The conducting country beam extinguishes.R ₃₅Setting be in order to keep C ₁₁High potential, prevent to travel and the distance light flicker takes place during meeting at dipped beam.SA ₁When placing dipped beam to travel, still available buttons SB sends to the other side and becomes the light command signal.

When dipped beam travels meeting, receive the other side's optical signal and make VD ₄During conducting, VD ₅Auto cutout, C in the light gradual change circuit simultaneously ₉Begin discharge, be fixed up after making passing light be darkened to predetermined value gradually.VD when meeting finishes ₄End VD ₅Conducting, passing light recover former illumination state.

Four: technological merit of the present invention and effect:

1: during meeting, vehicle light is the activation bit of automatic beam change, is again its controlled object, and the present invention has solved light effectively as the continuity problem that becomes optical drive information.Make the almost purpose of while automatic beam change of both sides' vehicle thereby reached.

2: the design of light gradual change circuit, changed traditional light sudden change situation, can improve driving environment, prevent the visually of short duration disappearance of road surface object.

3: change passive wait the other side in the past becomes light and becomes light (is prerequisite oneself at first to become light) into ACTIVE CONTROL the other side.Solved the problem that makes a lot of chaufeur worries.

4: used car is installed the present invention need not change original circuit.

5: circuit layout of the present invention, evolve after being convenient to and produce special-purpose automatic beam change integrated circuit.

Claims (5)

1: the invention belongs to the vehicular electrical appliance technical field.At present, the vehicle of night running is when meeting, and the variation of its road lighting light is by operation manually, and each bulb state variation bright or that go out is suddenlyd change.Chaufeur normally under the irradiation of the other side's country beam, waits for that the other side becomes light after initiatively becoming light.

Feature of the present invention is: can make two when the vehicle meeting that travels with distance light night, when their distance is close in the predetermined scope, can make two cars almost simultaneously become dipped beam automatically travels, subsequently, passing light is fixed up after being darkened to default brightness gradually, and after meeting finished, two cars recovered distance light automatically and travel, under particular surroundings or the situation, can use artificial enforcement functionalities.

2: the described ＂ of claim 1 becomes the dipped beam ＂ that travels automatically, it is characterized in that: two car intersections near the time, both sides all can experience the other side near information, in predetermined distance range, the information that always has a car to receive at first reaches preset strength, and this car sends from trend the other side at once and becomes the light command signal, exchanges information through both sides, under the automatic control circuit effect, make two cars almost simultaneously become dipped beam by distance light automatically and travel.

3: the described ＂ passing light of claim 1 is darkened to the ＂ that is fixed up after the default brightness gradually, it is characterized in that: after intersection two cars become dipped beam automatically and travel, As time goes on, distance moves closer to, the brightness of passing light is deepening gradually also, after changing to default brightness, just be fixed in this brightness, finish up to meeting.

4: the described automatic beam change design of claim 1, finish by the electronic circuit automatic guidance, the feature of circuit is: be made up of optical signal reception and discriminator circuit, state latching circuit, command signal generation and control circuit thereof, light gradual change and output circuit, automatic restoring circuit, artificial lock-on circuit etc., and link by specific logic requirement.

5: the feature of the artificial enforcement functionalities ＂ of the described ＂ of claim 1 is: both can replace the effect of automatic restoring circuit with hand push button, again can be in the meeting spacing, under the prerequisite of one's own side's automatic or manual change light, when the other side does not become the light time, send mandatory change light instruction by this button to the other side, the change light of ACTIVE CONTROL and realization the other side vehicle.

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