CN2159337Y - Automatic pretesting device of vehicle brake lamp - Google Patents

Abstract

The utility model relates to an automatic pretesting device of a vehicle brake lamp, which is composed of a pulse signal source, a pulse amplifier, a voltage-stabilizing source, a sampling and detecting Rk of light, a light detector, an audio sounder, a brake switch detection, brake lamps Dz, and in addition, a connected language sounder which is composed of language integrated package Ic. The utility model is suitable for detecting fault in advance, such as normal, open circuit, and short circuit of brake light circuits of vehicles, short circuit of the brake switch, broken circuit of the brake switch when treading brake, etc. so as to avoid serious traffic accidents resulted from brake fault. The utility model has the advantages of simple structure, reliable performance, and absolutely correct detection of brake fault, being suitable for various cars.

Description

Automatic pretesting device of vehicle brake lamp

The utility model relates to the leading automatic detector of a kind of brake of motor-driven vehicle lamp.

In the road transport process, brake of motor-driven vehicle is very important traffic safety device, and it is made up of mechanical brake device and Lamplight displayer two parts.Brake is made the usefulness of deceleration and parking, and stoplight stop lamp is to make the usefulness that warning back car prevents collision.The brake light indicating device is made up of braking signal switch and bulb.Vehicle is often because bulb open circuit, short circuit and switch bad contact, when stepping on when brake, bulb does not have luminous indication, makes the back car can't know that front truck brakes and continues to travel, may cause the bumper car accident, especially rainy day and night during high vehicle speeds possibility bigger.If braking signal switch is connected for a long time and can not be resetted in addition, stoplight stop lamp is luminous always, also can cause misjudgment to the back car, influences traffic safety.

Also do not have and brake lights failure can be detected the detector of notifying the timely handling failure of driver rapidly in the present brake of motor-driven vehicle device both domestic and external, the difficulty of this respect is: the mode of operation that just need know stoplight stop lamp before not braking, if when brake, know and just have little time to handle lighting fault, and the collision of two cars often goes out at this moment, therefore, detection must be leading.

The purpose of this utility model is for addressing the above problem, design and a kind ofly leading detect automatically that the brake light circuit is normal, open circuit, short circuit, BK Brake Switch short circuit and BK Brake Switch opens circuit when touching on the brake automatic detector, thereby avoid causing serious traffic accident because of the brake fault.

To achieve these goals, solution of the present utility model is: the leading automatic detector of brake of motor-driven vehicle lamp and BK Brake Switch (as shown in Figure 1), form by pulse signal source, pulse amplifier, source of stable pressure, light detection sampling Rk, light detector, audio tones Chinese percussion instrument, BK Brake Switch detection, brake indicating lamp Dz.Described impulse singla source output terminal connects the pulse amplifier input end, the input end that the pulse amplifier mouth connects source of stable pressure be connected light detector.A mouth of source of stable pressure connects BK Brake Switch K and stoplight stop lamp Dz, and another mouth connects light and detects sampling Rk, and the mouth of light detection sampling Rk connects the input end of light detector.The mouth of light detector connects the input end of audio tones Chinese percussion instrument.The end of BK Brake Switch K connection stoplight stop lamp Dz connects the input end of audio tones Chinese percussion instrument again, and its other end connects the positive pole of power supply.The utility model also connects a language sounder of being made up of language integrated package Ic, and the input end of described language sounder connects the mouth of BK Brake Switch K and light detector.

Describe structure of the present utility model and principle of work in detail below in conjunction with accompanying drawing.

Fig. 1 is a block scheme of the present utility model;

Fig. 2 is the utility model principle of work scheme drawing.

Referring to Fig. 2, aerotron T1, T2, resistance R 1～R5, the multi-vibrator that capacitor C 1, C2 form is a pulse signal source; Aerotron T3 is a pulse amplifier.Aerotron T4, T5, resistance R 6, Rk form source of stable pressure; Aerotron T6～T8, resistance R 7～R13 and Rk, diode D2～D6 form light detector, wherein resistance R k is a light detection signal sample resistance, aerotron T9～T11, resistance R 14～R17, capacitor C 3 is formed ring oscillator, the square wave that the generation cycle is about 0.5 second, T12 are served as square-wave signal and are amplified.T13, R18 self-excitation loudspeaker Dz1 form the audio tones Chinese percussion instrument.In order to express the mode of operation of stoplight stop lamp and BK Brake Switch K by language, also have a language sounder of forming by language integrated package Ic and loudspeaker Dz2, Z1 and Z2 are brake light bulb (each car has 2 or 4 bulbs).Wherein the signal impulse of pulse signal source generation is input to pulse amplitube T3 input end by resistance R 5, and the collecting electrode of T3 is by the base stage of the T4 in the R6 connection source of stable pressure, and its collecting electrode connects the emitter of the T8 of light detector simultaneously.Light detects the positive pole that sample resistance Rk one end connects power supply.Its other end connects the T4 in the source of stable pressure, the collecting electrode of T5.T5 emitter in the source of stable pressure connects stoplight stop lamp Dz and connects the base stage of the T13 in the acoustics circuit by diode D5, resistance R 18.Connect the language sounder of forming by language integrated package Ic and loudspeaker Dz2 by diode D2 simultaneously.T5 collecting electrode in the source of stable pressure connects T6 in the light detector and the base stage of T7 respectively by resistance R 8, R10.T6 collecting electrode in the light detector is by the base stage of the T13 in diode D6, the resistance R 18 connection audio tones Chinese percussion instruments, and the T8 collecting electrode is connected the language sounder of being made up of language integrated package Tc and loudspeaker Dz2 in the language sounder of being made up of language integrated package Ic and loudspeaker Dz2 by diode D3 connection, the light detector by diode D4 simultaneously.

Principle of work of the present utility model and working process are described below:

1, basic functional principle:

When BK Brake Switch K disconnects, bulb does not work, multi-vibrator is when the T2 conducting, negative potential makes the T3 conducting, and it provides the R6 positive potential on the one hand, connects the T8 emitter on the other hand, after R6 obtains positive potential, after D1 voltage stabilizing supply T4, T5 form compound amplification, from emitter-base bandgap grading output, a dark power supply Iz when the supply bulb is not luminous

Iz＝ (Uz)/(Rz)

Uz=UD1-Ube4-Ube5 in the formula, UD stabilivolt value is a constant, and Ube4, Ube5 are 0.7V, and Rz is a lamp resistance.

By following formula as can be known, Iz is a stationary value, not influenced by power line voltage, circuit working is after a period of time, and T2 is become by conducting and ends, and T3 also ends, the source of stable pressure no-output, Uz=0, Iz=0 is after a period of time, T2 is conducting again, make bulb is obtained dark current again, bulb obtains a pulse current so at regular intervals, and it produces loss in voltage as the light sensed signal sources at Rk.

When BK Brake Switch K connected, bulb side was a power line voltage, and T4, T5 are all instead ended partially, and source of stable pressure quits work automatically.

2, testing process

(1) two bulb normal operation (4 bulb principles are identical)

When K disconnects, bulb dark current Iz

Iz＝Iz1＋Iz2＝ (Uz)/(Rz1) ＋ (Uz)/(Rz2)

Two lamp currents are reduced to URk2 by its voltage of Rk

URk2＝Iz·Rk＝（Iz1＋Iz2）Rk

This voltage is added on the bleeder circuit of R9 and R10 composition, and the voltage of R9 is:

UR9＝ (URk2·R9)/(R9＋R10) ＝Ube7≥0.7V

T7 leads energy, and T8 ends, and the audio reproducing circuit is not worked, loudspeaker Dz, voiceless sound.

(2) one lamp normal operation, another lamp malfunction

Malfunction comprises that bulb damages, and bulb and lamp socket bad contact and bulb connect into bad contact, and being attributed in the bulb loop has breaking phenomena.When having only a lamp normal operation, half when dark current Iz is two lamp normal operation, it in the pressure drop of Rk is:

URk1＝1／2Iz·Rk＝1／2URk2

When obviously the UR9 of this moment is two lamps half

UR9〈0.4V

T7 ends, the T8 conducting has been connected T9～T11 and has been formed ring oscillator, and its output square wave is after T12 amplifies, control T13 connects self-excitation loudspeaker Dz1 and sends toot ... pout ... pulsed sound, this time is controlled by T3, when T3 ends, and T8 emitter open circuit, pulsed sound stops, after T3 transferred conducting to, T8 is conducting again, sent toot again ... toot sound.This sound recovers just constantly to send the warning driver as long as the bulb ripple has always.

When all damaging for two lamps, Tz=0, T7 ends, the T8 conducting, the result damages identical with a lamp.

(3) bulb side short circuit

During the bulb side short circuit, T5 grounded emitter and conducting, short circuit current Ik " Iz, the pressure drop that produces at Rk is:

URk＝Ik·Rk》URk2

In the bleeder circuit that R7, R8 form

UR7＝ (URk·R7)/(R7＋R8) ＝Ube6≥0.7V

The T6 conducting, positive potential makes the T13 conducting through D6, R18, and self-excitation loudspeaker Dz1 sends the sound, and its time length is identical with the T3 ON time.

(4) BK Brake Switch

When touching on the brake, BK Brake Switch is connected, and positive source is added on the bulb through K switch, and bulb is luminous, and positive pole makes the T13 conducting through D5, R18 simultaneously, and loudspeaker Dz1 sounds, and its time length equated with the time of touching on the brake.

When BK Brake Switch is malfunctioning when being open-circuit condition, positive source can't be added on bulb and the D5, and bulb can be not luminous, the loudspeaker voiceless sound.

When BK Brake Switch is malfunctioning when being closure state, bulb is luminous for a long time, and sound does not stop.

Comprehensive above-mentioned testing process reduces following feature:

1, two lamps are normal, the loudspeaker voiceless sound;

2, a lamp is normal, and the surplus lamp has open fault, sends very brief a little sound, stop a period of time after, send several very brief sound again, so be circulated to bulb recover normal till.

3, a short sound is sent in bulb side short circuit, stop a period of time after, send a short sound again, till so being circulated to short circuit and getting rid of.

4, the malfunctioning closure state that is in of BK Brake Switch, sound sends for a long time.

More than 4 kinds of states be leading detection.

5, step on brake, BK Brake Switch contacts, and sounds, and switch contacts bad noiseless.

In circuit shown in Figure 2, but also applicational language Ic promotes loudspeaker Dz2, when the T8 conducting, connects bulb open circuit language circuit by D4, when the T6 conducting, connects bulb short circuit language circuit by D3, when K switch is connected, by D2 brakes on language circuit.

The utility model proves its dependable performance through a large amount of tests, is fit to various domestic and imported vehicles and uses, all can normal operation ambient temperature-40 ℃～+ 75 ℃, detect accurate.

Claims (2)

1, the leading automatic detector of a kind of brake of motor-driven vehicle lamp, it is characterized in that it is by pulse signal source, pulse amplifier, source of stable pressure, light detects sampling Rk, light detector, the audio tones Chinese percussion instrument, BK Brake Switch detects and stoplight stop lamp Dz forms, the mouth of described pulse signal source connects the input end of pulse amplifier, the input end that the mouth of pulse amplifier connects source of stable pressure be connected light detector, a mouth of source of stable pressure connects BK Brake Switch and detects and stoplight stop lamp Dz, another mouth connects light and detects sampling Rk, light detects the input end of the mouth connection light detector of sampling Rk, the mouth of light detector connects the input end of audio tones Chinese percussion instrument, BK Brake Switch K connects the end of stoplight stop lamp Dz, the input end that connects the audio tones Chinese percussion instrument again, BK Brake Switch detects the positive pole that the other end connects power supply.

2, the leading automatic detector of brake of motor-driven vehicle lamp according to claim 1 is characterized in that also being connected with a language sounder of being made up of language integrated package Ic, and the input end of described language sounder connects the mouth of BK Brake Switch K and light detector.

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