CN105857176A - Automatic failure detection system of automobile brake lamp and working method of automatic failure detection system - Google Patents
Automatic failure detection system of automobile brake lamp and working method of automatic failure detection system Download PDFInfo
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- CN105857176A CN105857176A CN201610238190.XA CN201610238190A CN105857176A CN 105857176 A CN105857176 A CN 105857176A CN 201610238190 A CN201610238190 A CN 201610238190A CN 105857176 A CN105857176 A CN 105857176A
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- brake lamp
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- brake
- voltage comparator
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q11/00—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
The invention relates to an automatic failure detection system of an automobile brake lamp and a working method of the automatic failure detection system. The automatic failure detection system of the automobile brake lampcomprises a left brake lamp detection module and a right brake lamp detection module, and the left brake lamp detection module and right brake lamp detection module are used for detecting and reflecting the working states of a left brake lamp and a right brake lamp when a brake is stepped. According to the automatic failure detection system of the automobile brake lamp and the working method of the automatic failure detection system, the brake lamps are detected one time every time the brake is stepped by means of the circuit structure with low power consumption; the advantages of high real-time capability and good reliability are achieved; and failures of the brake lamps can be found in time, so that traffic accidents caused by failures of the brake lamps are avoided.
Description
Technical field
The invention belongs to technical field of automotive electronics, automatically detect system particularly to a kind of braking automobile lamp failure
System and method of work.
Background technology
Automobile has become as the vehicles commonly used in people's daily life, when emergency occurs, and department
Machine generally rely on visual signal (such as brake lamp) obtain warning, therefore brake lamp the most intact be to ensure that driving peace
One of full major measure.The brake lamp of current most of low and middle-grade automobiles does not has automatic failure detection function,
When brake lamp breaks down, driver self is difficult to find, accordingly, it would be desirable to invent a kind of brake lights failure certainly
Motion detection device is installed on automobile, and once brake lamp cisco unity malfunction, prompting lighted automatically by alarm lamp
Driver's on-call maintenance changes brake lamp, reduces the rear-ended car accident caused because of brake lights failure.
Summary of the invention
It is an object of the invention to provide a kind of automobile brake lamp automatic fault detection system and method for work, with reality
Now detection automatic to brake lamp, it is to avoid the rear-ended car accident caused because of brake lights failure.
In order to solve above-mentioned technical problem, the invention provides a kind of automobile brake lamp automatic fault detection system,
It is characterized in that, including: left and right brake lamp detection module, this left and right brake lamp detection module is suitable to
When brake is stepped on, to detect and to react the duty of left and right brake lamp.
Further, the circuit structure of described left and right brake lamp detection module is identical, all includes: be used for detecting
The current detection circuit of brake lamp operating current, the voltage comparator circuit being connected with this current detection circuit, should
Voltage comparator circuit by the output level of current detection circuit compared with reference voltage, to obtain breakdown judge
Level, and this breakdown judge level is accessed to fault display circuit, to react the work of left and right brake lamp
State.
Further, described current detection circuit includes: current detecting chip, the electric current of this current detecting chip
Input is connected with the supply line of brake lamp, and the brake lamp operating current of acquisition is turned by this current detecting chip
It is changed to corresponding output level；Described voltage comparator circuit includes: voltage comparator, this voltage comparator same
Holding the voltage output end with current detecting chip to be connected mutually, its end of oppisite phase accesses a reference voltage, and this electricity
The outfan of pressure comparator is suitable to a display lamp job in driving malfunction display circuit；Work as brake lights failure, i.e.
When current detection circuit is not detected by brake lamp operating current, the output level of described current detecting chip is less than
Reference voltage, then voltage comparator output breakdown judge level is low level, and display lamp lights.
Another aspect, in order to solve same technical problem, present invention also offers a kind of automobile brake lamp event
The method of work of barrier automatic checkout system.
Described automobile brake lamp automatic fault detection system includes: left and right brake lamp detection module,
When brake is operated, described left and right brake lamp detection module is adapted to detect for and reacts left and right brake
The duty of lamp.
Further, the circuit structure of described left and right brake lamp detection module is identical, all includes: be used for detecting
The current detection circuit of brake lamp operating current, the voltage comparator circuit being connected with this current detection circuit, should
Voltage comparator circuit by the output level of current detection circuit compared with reference voltage, to obtain breakdown judge
Level, and this breakdown judge level is accessed to fault display circuit, to react the work of left and right brake lamp
State.
Further, described current detection circuit includes: current detecting chip, the electric current of this current detecting chip
Input is connected with the supply line of brake lamp, and the brake lamp operating current of acquisition is turned by this current detecting chip
It is changed to corresponding output level；Described voltage comparator circuit includes: voltage comparator, this voltage comparator same
Holding the voltage output end with current detecting chip to be connected mutually, its end of oppisite phase accesses a reference voltage, and this electricity
The outfan of pressure comparator is suitable to a display lamp job in driving malfunction display circuit；Work as brake lights failure, i.e.
When current detection circuit is not detected by brake lamp operating current, the output level of described current detecting chip is less than
Reference voltage, then voltage comparator output breakdown judge level is low level, and display lamp lights.
The invention has the beneficial effects as follows, the automobile brake lamp automatic fault detection system of the present invention and method of work,
By the circuit structure of low-power consumption, it is achieved that all brake lamp is carried out one-time detection when stepping on brake every time,
Have real-time, the advantage of good reliability, it is possible to find brake lights failure in time, it is to avoid due to brake lamp
The vehicle accident that fault causes.
Accompanying drawing explanation
The present invention is further described with embodiment below in conjunction with the accompanying drawings.
Fig. 1 is the theory diagram of the automobile brake lamp automatic fault detection system of the present invention；
Fig. 2 is the circuit theory diagrams of the automobile brake lamp automatic fault detection system of the present invention.
Detailed description of the invention
In conjunction with the accompanying drawings, the present invention is further detailed explanation.These accompanying drawings are the schematic diagram of simplification,
The basic structure of the present invention is described the most in a schematic way, and therefore it only shows the composition relevant with the present invention.
Embodiment 1
A kind of automobile brake lamp automatic fault detection system of the present invention, including: left and right brake lamp detection mould
Block, this left and right brake lamp detection module is suitable to when brake is stepped on, to detect and to react left and right brake lamp
Duty.
As it is shown in figure 1, the circuit structure of described left and right brake lamp detection module is identical and all includes: be used for
The current detection circuit of detection brake lamp operating current, the voltage comparator circuit being connected with this current detection circuit,
The output level of current detection circuit compared with reference voltage, is sentenced obtaining fault by this voltage comparator circuit
Power-off is put down, and this breakdown judge level is accessed to fault display circuit, to react the work of left and right brake lamp
Make state.
As in figure 2 it is shown, concrete, described current detection circuit includes: current detecting chip, and this electric current is examined
The current input terminal surveying chip is connected with the supply line of brake lamp, the brake that this current detecting chip will obtain
Lamp operating current is converted to corresponding output level；Described voltage comparator circuit includes: voltage comparator, this electricity
The in-phase end of pressure comparator is connected with the voltage output end of current detecting chip, and its end of oppisite phase accesses a benchmark electricity
Press, and the outfan of this voltage comparator is suitable to a display lamp job in driving malfunction display circuit；When stopping
When car light fault, i.e. current detection circuit are not detected by brake lamp operating current, described current detecting chip
Output level is less than reference voltage, then voltage comparator output breakdown judge level is low level, and display lamp is bright
Rise.
Further, described current detecting chip is such as but not limited to using current detecting chip ACS712, described
Reference voltage is such as but not limited to selecting 2.6V；And display lamp is such as but not limited to using light emitting diode
(LED1 and LED2).
Further, this automobile brake lamp automatic fault detection system is suitable to from Vehicular accumulator cell power taking, and it includes 5V
Voltage stabilizing module, such as but not limited to the 5V Voltage stabilizing module using 7805 compositions.
Embodiment 2
On the basis of embodiment 1, present invention also offers a kind of automobile brake lamp automatic fault detection system
Method of work.
Wherein, described automobile brake lamp automatic fault detection system includes: left and right brake lamp detection module,
When brake is operated, described left and right brake lamp detection module is adapted to detect for and reacts left and right brake
The duty of lamp.
Further, the circuit structure of described left and right brake lamp detection module is identical, all includes: be used for detecting
The current detection circuit of brake lamp operating current, the voltage comparator circuit being connected with this current detection circuit, should
Voltage comparator circuit by the output level of current detection circuit compared with reference voltage, to obtain breakdown judge
Level, and this breakdown judge level is accessed to fault display circuit, to react the work of left and right brake lamp
State.
Concrete, described current detection circuit includes: current detecting chip, the electric current of this current detecting chip
Input is connected with the supply line of brake lamp, and the brake lamp operating current of acquisition is turned by this current detecting chip
It is changed to corresponding output level；Described voltage comparator circuit includes: voltage comparator, this voltage comparator same
Holding the voltage output end with current detecting chip to be connected mutually, its end of oppisite phase accesses a reference voltage, and this electricity
The outfan of pressure comparator is suitable to a display lamp job in driving malfunction display circuit；Work as brake lights failure, i.e.
When current detection circuit is not detected by brake lamp operating current, the output level of described current detecting chip is less than
Reference voltage, then voltage comparator output breakdown judge level is low level, and display lamp lights.
On the basis of embodiment 1 and embodiment 2, the work to this automobile brake lamp automatic fault detection system
Principle is described in detail.
(1) left and right brake lamp is all normal, steps on brake S1, and two brake lamps are bright, and electric current is by left current detecting
Chip U2, right current detecting chip U3, the voltage of two chips exports 7 feet and is 2.8V, left voltage comparator
The inverting input of U4 and right voltage comparator U4A is 2.6V, normal phase input end > inverting input, left electricity
Pressure comparator U4 and right voltage comparator U4A is all output as high level, and LED 1, LED2 are not
Bright.
(2) two brake lamps have a damage (as bad in left brake lamp), owing to left brake lamp is bad, is stepping on
During brake S1, IP+, IP-end of left current detecting chip U2 does not has electric current, and its voltage is output as 2.5V,
Voltage comparator U4 inverting input is 2.6V, and normal phase input end is less than inverting input, voltage comparator
U4 is output as low level, and red light emitting diodes LED1 is lit, and instruction left side brake lamp is bad, needs in time
Maintenance is changed；Right current detecting chip U3 current detecting chip I P+, IP-have electric current, and its voltage is output as
2.8V, the inverting input of voltage comparator U4A is 2.6V, therefore the normal phase input end of voltage comparator U4A
More than inverting input, voltage comparator U4A is output as high level, and red light emitting diodes LED2 does not works.
(3) two brake lamps are the worst, when stepping on brake S1, and left current detecting chip U2, right current detecting
IP+, IP-of chip U3 do not have electric current, and its voltage is output as 2.5V, and voltage comparator U4, voltage ratio are relatively
Device U4A inverting input is 2.6V, therefore the normal phase input end of two voltage comparators is respectively less than inverting input,
Therefore, two red light emitting diodes are all lighted by two voltage comparators, show that two brake lamps are all broken, and need
Change in time.
As in figure 2 it is shown, this automobile brake lamp automatic fault detection system has the advantage that
(1) design of 5V mu balanced circuit requires that load current is milliampere level (low power consumption), loads as electric resistance partial pressure
Circuit, comprising: resistance R2, resistance R3, resistance R1, resistance R4, red light emitting diodes LED1,
Red light emitting diodes LED2；When two brake lamps are normal, load as resistor voltage divider circuit, i.e. resistance R2,
Resistance R3, its electric current is 0.24mA；When left (right) brake lamp bad time, load as resistor voltage divider circuit, i.e.
Resistance R2, resistance R3, resistance R1, red light emitting diodes LED1, electric current is 25mA；When two brake lamps
In all bad times, load as resistor voltage divider circuit, i.e. resistance R2, resistance R3, resistance R1, red light emitting diodes
LED1, resistance R4, red light emitting diodes LED2, now electric current is 50mA, therefore whole circuit is in low
Power consumption state (maximum power dissipation is less than 250 milliwatts).
(2) current comparison circuit design requires that the resistance sealing in circuit must be little, does not affect the brightness of brake lamp,
Therefore using the current detecting chip ACS712 range ± 5A chip with Hall effect, this chip importation is
One section lead, resistance the least (1.2m Ω).
(3) voltage comparator circuit design requires when two brake lamps are normal, and corresponding light emitting diode does not works,
When occurring damaging, ability is the brightest, therefore voltage comparator uses LM339, its inverting input voltage design 2.6V.
(4) fault display circuit design requires that light emitting diode is low power LED, for protection luminescence
Diode, series resistance R4 is 120 Ω.
With the above-mentioned desirable embodiment according to the present invention for enlightenment, by above-mentioned description, related work
Personnel can carry out various change and amendment completely in the range of without departing from this invention technological thought.
The content that the technical scope of this invention is not limited in description, it is necessary to according to right
Determine its technical scope.
Claims (6)
1. an automobile brake lamp automatic fault detection system, it is characterised in that including: left and right brake lamp
Detection module, this left and right brake lamp detection module is suitable to when brake is stepped on, to detect and to react left and right
The duty of brake lamp.
Automobile brake lamp automatic fault detection system the most according to claim 1, it is characterised in that institute
The circuit structure stating left and right brake lamp detection module is identical, all includes:
For detecting the current detection circuit of brake lamp operating current, the voltage being connected with this current detection circuit
Comparison circuit, this voltage comparator circuit by the output level of current detection circuit compared with reference voltage, with
Obtain breakdown judge level, and this breakdown judge level is accessed to fault display circuit, to react left and right
The duty of brake lamp.
Automobile brake lamp automatic fault detection system the most according to claim 2, it is characterised in that institute
State current detection circuit to include: current detecting chip, the current input terminal of this current detecting chip and brake lamp
Supply line be connected, the brake lamp operating current of acquisition is converted to export accordingly electricity by this current detecting chip
Flat；
Described voltage comparator circuit includes: voltage comparator, the in-phase end of this voltage comparator and current detecting
The voltage output end of chip is connected, and its end of oppisite phase accesses a reference voltage, and the output of this voltage comparator
End is suitable to a display lamp job in driving malfunction display circuit；
Working as brake lights failure, when i.e. current detection circuit is not detected by brake lamp operating current, described electric current is examined
The output level surveying chip is less than reference voltage, then voltage comparator output breakdown judge level is low level,
Display lamp lights.
4. the method for work of an automobile brake lamp automatic fault detection system, it is characterised in that
Described automobile brake lamp automatic fault detection system includes: left and right brake lamp detection module,
When brake is operated, described left and right brake lamp detection module is adapted to detect for and reacts left and right brake
The duty of lamp.
Method of work the most according to claim 4, it is characterised in that described left and right brake lamp detects
The circuit structure of module is identical, all includes:
For detecting the current detection circuit of brake lamp operating current, the voltage being connected with this current detection circuit
Comparison circuit, this voltage comparator circuit by the output level of current detection circuit compared with reference voltage, with
Obtain breakdown judge level, and this breakdown judge level is accessed to fault display circuit, to react left and right
The duty of brake lamp.
Method of work the most according to claim 5, it is characterised in that described current detection circuit includes:
Current detecting chip, the current input terminal of this current detecting chip is connected with the supply line of brake lamp, this electricity
The brake lamp operating current of acquisition is converted to corresponding output level by stream detection chip；
Described voltage comparator circuit includes: voltage comparator, the in-phase end of this voltage comparator and current detecting
The voltage output end of chip is connected, and its end of oppisite phase accesses a reference voltage, and the output of this voltage comparator
End is suitable to a display lamp job in driving malfunction display circuit；
Working as brake lights failure, when i.e. current detection circuit is not detected by brake lamp operating current, described electric current is examined
The output level surveying chip is less than reference voltage, then voltage comparator output breakdown judge level is low level,
Display lamp lights.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610238190.XA CN105857176A (en) | 2016-04-15 | 2016-04-15 | Automatic failure detection system of automobile brake lamp and working method of automatic failure detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610238190.XA CN105857176A (en) | 2016-04-15 | 2016-04-15 | Automatic failure detection system of automobile brake lamp and working method of automatic failure detection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105857176A true CN105857176A (en) | 2016-08-17 |
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ID=56632163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610238190.XA Pending CN105857176A (en) | 2016-04-15 | 2016-04-15 | Automatic failure detection system of automobile brake lamp and working method of automatic failure detection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107957564A (en) * | 2017-12-06 | 2018-04-24 | 东风商用车有限公司 | A kind of Brake lamp fault diagnosis circuit |
Citations (6)
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|---|---|---|---|---|
| JPS6181834A (en) * | 1984-09-25 | 1986-04-25 | Honda Motor Co Ltd | Abnormality detecting system for stop lamp system |
| CN2106099U (en) * | 1991-10-26 | 1992-06-03 | 王金厚 | Brake lamp failure monitor alarm for car |
| CN2126628Y (en) * | 1992-07-10 | 1993-01-27 | 北京市丰盛汽车警报器厂 | Failure alarm for automotive braking light |
| CN2574944Y (en) * | 2002-09-28 | 2003-09-24 | 蒋龙潭 | Flying vehicle |
| CN201494368U (en) * | 2009-09-28 | 2010-06-02 | 柴军锋 | Fault monitor for automobile brake light |
| CN104760539A (en) * | 2015-02-14 | 2015-07-08 | 李超 | State monitor of vehicle stop lamps |
-
2016
- 2016-04-15 CN CN201610238190.XA patent/CN105857176A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6181834A (en) * | 1984-09-25 | 1986-04-25 | Honda Motor Co Ltd | Abnormality detecting system for stop lamp system |
| CN2106099U (en) * | 1991-10-26 | 1992-06-03 | 王金厚 | Brake lamp failure monitor alarm for car |
| CN2126628Y (en) * | 1992-07-10 | 1993-01-27 | 北京市丰盛汽车警报器厂 | Failure alarm for automotive braking light |
| CN2574944Y (en) * | 2002-09-28 | 2003-09-24 | 蒋龙潭 | Flying vehicle |
| CN201494368U (en) * | 2009-09-28 | 2010-06-02 | 柴军锋 | Fault monitor for automobile brake light |
| CN104760539A (en) * | 2015-02-14 | 2015-07-08 | 李超 | State monitor of vehicle stop lamps |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107957564A (en) * | 2017-12-06 | 2018-04-24 | 东风商用车有限公司 | A kind of Brake lamp fault diagnosis circuit |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160817 |
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| RJ01 | Rejection of invention patent application after publication |