CN2748336Y - Intelligent automobile speed variation display lamp - Google Patents
Intelligent automobile speed variation display lamp Download PDFInfo
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- CN2748336Y CN2748336Y CN 200420085142 CN200420085142U CN2748336Y CN 2748336 Y CN2748336 Y CN 2748336Y CN 200420085142 CN200420085142 CN 200420085142 CN 200420085142 U CN200420085142 U CN 200420085142U CN 2748336 Y CN2748336 Y CN 2748336Y
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- speed
- display lamp
- motor vehicle
- automobile
- microprocessor chip
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Abstract
The utility model discloses an intelligent automobile speed variation display lamp, comprising a microprocessor chip, an automobile speed variation display lamp and a power circuit. The data input port of the microprocessor chip is connected with the detection signal output end of the detection sensor of the automobile speed, and the data output port of the microprocessor chip is directly connected with the automobile speed variation display lamp. The microprocessor chip is used to read / take samples to the output signals of the detection sensor of the automobile speed once in every definite sampling period, which calculates the automobile speed at this time, and compares to the automobile speed calculated last time. If the automobile speed generates changes, the data output port of the microprocessor chip can output control singals, which enables the automobile speed variation display lamp to work and to react the states of acceleration and deceleration of the automobile timely and to prompt a driver at the back of the automobile to adopt corresponding measures. The utility model has the advantages of simple structure, fast reaction speed and high dependability; the intelligent automobile speed variation display lamp can effectively avoid generating the accidents of the automobile rear-end collision. The utility model can be applied to the existing automobiles of any models; the installation is convenient.
Description
Technical field
The utility model relates to a kind of display lamp, specifically, relates to a kind of full automatic vehicle speed of a motor vehicle that is installed in automobile tail, display automobile acceleration in real time, deceleration and changes display lamp, and this display lamp can prevent the generation of rear-end collision accident effectively.
Background technology
In recent years, along with the increase of car owning amount, the raising of the speed of a motor vehicle, traffic accident is linearly risen.Wherein, the rear-end collision accident is particularly outstanding.Particularly on express highway, be car crash in case rear-end collision accident majority takes place, sometimes even the pernicious traffic accident of several cars and even tens a chain of rear-end impacts of car takes place, suffer heavy losses.Along with the progress of science and technology, people recognize that gradually it is impossible stopping traffic accident fully, and still, it is possible initiatively reducing, prevent traffic accident, avoid personnel to injure.According to investigations, for the traffic accident more than 90%, take emergency measures if chaufeur can shift to an earlier date a second, traffic accident (traffic accident) is avoidable.By analyzing the rear-end impact accident causation, we find that also its major cause is: back vehicle and fwd vehicle distances are near excessively, and back vehicle has little time to take emergency measures.In accident investigation, the car driver of knocking into the back has common words " ... I touch on the brake at once, but there's not enough time "." have little time " to take in other words the time of emergency braking not enough.When front car driver finds that situation or obstacle appear in road surface, the place ahead, can slow down or slide, but back car driver does not often know that situation appears in the front, and the front car slows down, still keep original speed, cause having shortened in unconscious distance between two cars,, may find situation when back car driver recognizes the front along with the minimizing of two spacings, take measures there's not enough time, car has bumped against the tailstock of front car again.
So, if can invent a kind of display lamp, be installed in automobile tail, in real time, exactly acceleration, constant speed, the deceleration of this car are in time informed the back vehicle, the back vehicle drivers obtains initiatively to take corresponding measure in advance after this information, remain the safety distance between two cars, just can avoid the generation of vehicle rear-end collision collision case.
Summary of the invention
In view of the foregoing, but the purpose of this utility model provides a kind of full automatic vehicle speed of a motor vehicle that is installed in automobile tail real-time response car acceleration, deceleration changes display lamp.This speed of a motor vehicle changes the acceleration information that display lamp not only can reflect this car in real time, the more important thing is deceleration that it can this car of real-time response sliding the decelerating phase before promptly taking to brake, inform that back car driver in time takes corresponding measure, avoids the generation of rear-end impact accident.
For achieving the above object, the utility model is taked following design plan: a kind of full automatic vehicle speed of a motor vehicle changes display lamp, and it changes display lamp by microprocessor chip, the speed of a motor vehicle and power circuit constitutes;
The quantitative data input mouth of described microprocessor chip links to each other with the detection signal mouth of automobile speed detecting sensor, and the data output of microprocessor chip directly changes display lamp with the speed of a motor vehicle and links to each other;
Described microprocessor chip is a core component of the present utility model, and it reads the signal of a speed of a motor vehicle detecting sensor output every certain sampling period, calculates the speed of automobile this moment, and compares with the speed of a motor vehicle of last time calculating; If automobile speed changes, then the data output of microprocessor chip is just exported control signal, makes the speed of a motor vehicle change display lamp work.
The operating frequency range of described microprocessor is set between the 100HZ to 5KHZ and (starts working when the corresponding speed of a motor vehicle reaches the 20km/h left and right sides), and the sampling period is 1/4 second.
The described speed of a motor vehicle changes display lamp and comprises the deceleration regime display lamp, and this deceleration regime display lamp links to each other with the data output of described microprocessor chip.The described speed of a motor vehicle changes display lamp and also comprises the acceleration mode display lamp, and this acceleration mode display lamp links to each other with another data output of described microprocessor chip.The described speed of a motor vehicle changes display lamp and also comprises the constant speed state display lamp, and this constant speed state display lamp links to each other with the another data output of described microprocessor chip.
Described speed of a motor vehicle detecting sensor can be the car speed sensor that automobile itself is carried, and the detection signal mouth of this car speed sensor links to each other with the data input pin of described microprocessor through the waveform arrangement of Schmidt trigger.
Described speed of a motor vehicle detecting sensor can also be the wheel speed sensor that automobile itself is carried, and the detection signal mouth of this wheel speed sensor links to each other with the data input pin of described microprocessor through the waveform arrangement of Schmidt trigger.
Described speed of a motor vehicle detecting sensor can also be the Hall car speed sensor, and the detection signal mouth of this Hall car speed sensor links to each other with the data input pin of described microprocessor through the aerotron amplification.
The utility model has the advantages that: 1, simple in structure, speed of response is fast, reliability is high.2, the most important thing is that the utility model can avoid rear-end collision collision effectively, when travelling, can make back car driver grasp the speed information of front truck at any time, reduce tired driver with car.3, car driver in back can receive throttle, fuel-economizing in advance; Reduce the braking number of times, prolong drg and integeral vehicle life.4, the utility model can be applicable in existing any vehicle, and is easy for installation.
Description of drawings
Fig. 1 is a functional block diagram of the present utility model
Fig. 2 is physical circuit figure of the present utility model
Fig. 3 is the utility model Hall car speed sensor schematic diagram
Fig. 4 is the utility model 5 double frequency pulse multiplier physical circuit figure
The specific embodiment
As shown in Figure 1, the disclosed full automatic vehicle speed of a motor vehicle variation of the utility model display lamp mainly is made of microprocessor chip MCU, speed of a motor vehicle variation display lamp and power circuit.The quantitative data input mouth of microprocessor chip links to each other with the detection signal mouth of automobile speed detecting sensor, and the data output of microprocessor chip directly changes display lamp with the speed of a motor vehicle and links to each other.
Core component of the present utility model is microprocessor chip MCU, and it reads the signal of a speed of a motor vehicle detecting sensor output every certain sampling period, calculates the speed of automobile this moment, and compares with the speed of a motor vehicle of last time calculating.If automobile speed changes, then the data output of microprocessor chip MCU is just exported control signal, makes the corresponding speed of a motor vehicle change display lamp work according to the situation of change of the speed of a motor vehicle.
It can be the deceleration regime display lamp that the described speed of a motor vehicle changes display lamp; Or deceleration regime display lamp and acceleration mode display lamp, can also be deceleration regime display lamp, acceleration mode display lamp and constant speed state display lamp.Microprocessor chip MCU can be according to the variation of the speed of a motor vehicle, and the output control signal corresponding makes deceleration regime display lamp or acceleration mode display lamp or constant speed state display lamp bright, the variation of reaction automobile speed, and prompting back car driver takes corresponding measure.
Just have the automobile of car speed sensor or wheel speed sensors for itself, described speed of a motor vehicle detecting sensor refers to car speed sensor or vehicle wheel speed sensors.The quantitative data input mouth of microprocessor chip links to each other with the detection signal mouth of car speed sensor or wheel speed sensors.
Fig. 2 is the utility model physical circuit figure.As shown in the figure, chip U1 (78L05) is a 5V voltage stabilizing chip, and it mainly is for microprocessor chip U3 (PIC12F629) and the speed of a motor vehicle changes display lamp LED1, LED2, LED3 provide 5V working power.
Microprocessor chip U3 (PIC12F629) is a core component of the present utility model, and it has 4 tunnel 8 A/D interfaces, is built-in with E
2Prom memory, built-in 4MH
ZRC type oscillation source, big drive current, but direct drive LED charactron shows.As shown in the figure, the signal output part of car speed sensor or wheel speed sensors through capacitor C 1 be coupled to Schmidt trigger (constituting) U2 by 555 chips the signal input tube pin, after waveform arrangement, link to each other with the quantitative data input mouth GP5 of microprocessor chip U3; Data output GP0, the GP1 of microprocessor chip U3, GP2 link to each other the variation of the real-time response speed of a motor vehicle with acceleration mode display lamp LED1, constant speed state display lamp LED2, deceleration regime display lamp LED3 respectively.
The car speed sensor that is used to detect automobile driving speed is installed near the Automotive transmission output shaft usually, and it reacts the speed of a motor vehicle of automobile by the rotating speed that detects transmission output shaft, its output be a frequency signal.
Be used to detect the wheel speed sensors that automotive wheel rotates and be installed in wheel place or main reduction gear place usually, the anti-wheel lock system (ABS) that is changed to by the inspection vehicle wheel speed provides data, its output also be a frequency signal.
The principle of work of car speed sensor and wheel speed sensors is identical, all is that the velocity of rotation with object converts pulse duration frequency signal output to, and this pulse duration frequency signal is directly proportional with rotating speed, and rotating speed is directly proportional with the speed of a motor vehicle again.The utility model is shaped to the square wave frequency signal by Schmidt trigger (555 chip) U2 with the frequency signal of car speed sensor or wheel speed sensors output, and can realize the conversion of varying level between sensor+12V, the U3 microprocessor+5V.
In order to compare the variation of automobile rotational speed, the utility model is set in the frequency of operation of microprocessor between the 100HZ to 5KHZ, microprocessor was started working when the corresponding speed of a motor vehicle reached the 20km/h left and right sides, and this is according to the wheel speed sensor output frequency of numerous vehicles and fixed.
For example: the gear ring that Japan produces the wheel speed sensor of HCR32 (RB20DET) type automobile is 46 teeth, and whenever circling is 46 pulses.Its vehicle tyre theoretical running radius of tire is 301+7mm, and circumference is 1890.28mm.When the tachogen output frequency is 100H
ZThe time, be equivalent to wheel 2.174 circle/per seconds, promptly 4.109m/s is equivalent to 14.79km/h; When the tall and big 200km/h of the speed of a motor vehicle, the tachogen output frequency is 1351H
Z
Again for example: the gear ring of the wheel speed sensor of homemade Shanghai Cherry automobile is 43 teeth, and whenever circling is 43 pulses.Its vehicle tyre theoretical running radius of tire is 282mm, and circumference is 1770.96mm.When the tachogen output frequency is 100H
Z0 o'clock, be equivalent to wheel 2.325 circle/per seconds, promptly 4.118m/s is equivalent to 14.82km/h; When the tall and big 200km/h of the speed of a motor vehicle, the tachogen output frequency is 1350H
Z
This shows, it is for the utility model can be started working when the speed of a motor vehicle is 10-20km/h that the frequency of operation of microprocessor MCU is set between the 100HZ to 5KHZ, and the output frequency of its upper limiting frequency sensor when being far longer than maximum speed makes the utility model go for all vehicles both at home and abroad.
When using car speed sensor, its principle is identical with wheel speed sensors, repeats no more.It is different with the gear ring number of teeth of wheel that difference is that transmission output shaft is used to produce the gear ring number of teeth of impulse singla, for example: 4 pairs of magnetic poles of the car speed sensor of Audi car are fixed on the output shaft of change-speed box, that is: a moving week of transmission shaft revolution produces 4 electric pulse, cooperation parameter such as following table between the speed of a motor vehicle and the sensor frequency signal:
| The speed of a motor vehicle (km/h) | 20 | 60 | 100 | 150 | 200 |
| Frequency (HZ) | 17.5～22.9 | 61.5～68.6 | 104.9～114.4 | 159.8～170.6 | 213.3～225.2 |
Thus the table as seen, when frequency at 100H
ZThe time speed of a motor vehicle near 100km/h, the time that the U3 microprocessor is started working is too late.For these vehicles 2 kinds of processing schemes are arranged:
1, changes the operating frequency range of U3 microprocessor, set frequency of operation at 20H
Z～5KH
Z, microprocessor is started working when making the speed of a motor vehicle less than 20km/h;
If 2 do not change the frequency of operation (100H of U3
Z～5KH
Z), can between car speed sensor and U3, increase by one " five double frequency pulse multipliers " (with reference to figure four), promptly 1 impulse singla of sensor is become 5 impulse singlas and supply with U3, U3 starts working in the time of equally also making the speed of a motor vehicle less than 20km/h.
Principle of work of the present utility model is:
As shown in Figure 4, when the speed of running car greater than per hour tens kilometers the time, the pulse duration frequency signal of car speed sensor or the output of wheel speed sensors, waveform arrangement through U2, the 7th pin output from U2, be transferred to the 2nd pin GP5 of microprocessor U3, the square wave frequency signal that the 2nd pin GP5 of U3 obtains changing.When the frequency of car speed sensor output during greater than 100HZ, U3 leaves frequency FA at this moment in the register in, delay time after 1/4 second, U3 reads the frequency signal FB of car speed sensor output again, and with memory device in before 1/4 second frequency FA relatively, draw three kinds of FA＞FB, FA＜FB, FA=FB as a result; And back one frequency FB deposit in again in the memory device with 1/4 second after sampling frequency continue relatively to calculate, frequency gets higher is that FA＞FB represents car acceleration, the data output end GP0 output high level of U3 drives T1, T2 and makes LED1, LED2 bright entirely, sends high light; The constant FA=FB of being of frequency represents automobile constant speed, and the data output end GP1 output high level of U3 drives T2 and makes LED2 bright, sends the low light level; It is that FA＜FB represents car deceleration that frequency reduces, and the data output end GP2 of U3 output high level drives T3 and makes LED3 bright, sends the light with LED1, LED2 different colours, and the expression automobile is slowing down, and back car driver will take corresponding measure.When depressing brake pedal, the base stage of aerotron T4 is the high level conducting, and the input end GP3 of U3 becomes low level, and GP0, GP1, GP2 are low level, and LED1, LED2, LED3 all do not work, and this moment, the red drag lamp of automobile self was bright.
The sampling interval that microprocessor U3 the adopted 1/4 second detection signal, the comparison calculation mode that read car speed sensor or wheel speed sensor output be because of the speed of a motor vehicle and people's capability of reaction fixed.When speed of a motor vehicle 60km/h, automobile travelled 4.16 meters in 1/4 second; During speed of a motor vehicle 100km/h, automobile travelled 6.9 meters in 1/4 second; During speed of a motor vehicle 140km/h, automobile travelled 9.7 meters in 1/4 second.The vehicle rear-end collision accident mostly occur run at high speed, the driver can not accurately judge the front vehicles deceleration regime, causes unintentionally with car nearby, when front truck was taked emergency braking, back car caused knocking into the back because of stopping distance inadequately.The inventor threshed with the car experiment with two same model cars (Santana),
The A car: front truck, speed of a motor vehicle 100km/h, pine tar (neutral) slides 300 meters of Reduced Speed Now
The B car: the back car, with the A car in the same way, with speed, apart from 100 meters of front trucks, at the uniform velocity travel
| Slide the front truck distance | The speed of a motor vehicle | Time | The speed of a motor vehicle | Operating range | Slide the back spacing | |
| The A car | 100km/h | 12 seconds | 90km/h | 300 meters | ||
| The B car | Apart from 100 meters of front trucks | 100km/h | 12 seconds | 100km/h | 333 meters | Apart from 67 meters of front trucks |
Thus table as seen, when not using the utility model, when front truck (A) speed of a motor vehicle drops to 90km/h, when two spacings shortened to 67 meters, back car driver just had obvious sensation to the deceleration of front truck, afterwards the late front truck of car began pine tar (sliding) 12 seconds at this moment.
If install the utility model additional, as front truck A (being equivalent to twice 2 * 1/4 seconds=1/2 second judgement cycle of microprocessor) when 100km/h drops to 98km/h, microprocessor just can make the deceleration display lamp bright, people's vision is relatively more responsive to light, can make reflection in 1/2 second, and back car B just can judge the front truck deceleration with display lamp in 1 second time so, and take measures, two car actual distances shorten less than 5 meters, and two spacings prevent effectively that greater than 95 meters two spacings are near excessively at this moment.
The utility model not only can use the car speed sensor of former car assembling or wheel speed sensors as signal source, can also be by Hall car speed sensor of the present utility model (as shown in Figure 3) the detection speed of a motor vehicle for the vehicle of not assembling car speed sensor and wheel speed sensors.What this Hall element was exported is the square wave frequency signal, and its detection signal mouth directly links to each other with the signal input part GP5 of microprocessor U3 by the aerotron amplification.
In order to meet people's custom, can elect car deceleration display lamp LED3 as yellow, LED2 elects green as with the automobile constant speed display lamp, and LED1 elects green as with the car acceleration display lamp.When car acceleration, LED1 and LED2 be bright entirely, send strong green glow.
The utility model is simple in structure, speed of response is fast, reliability is high; Can avoid the rear-end collision collision effectively, when travelling, can make back car driver grasp the speed information of front truck at any time, increase driving enjoyment, reduce tired driver in fleet or with car.The utility model can be applicable in existing any vehicle, and is easy for installation.
The above is concrete enforcement example of the present utility model and the know-why used, and is any based on the equivalent transformation on the technical solutions of the utility model basis, all belongs within the utility model protection domain.
Claims (8)
1, a kind of full automatic vehicle speed of a motor vehicle changes display lamp, it is characterized in that: it changes display lamp by microprocessor chip, the speed of a motor vehicle and power circuit constitutes;
The quantitative data input mouth of described microprocessor chip links to each other with the detection signal mouth of automobile speed detecting sensor, and the data output of microprocessor chip directly changes display lamp with the speed of a motor vehicle and links to each other;
Described microprocessor chip is a core component of the present utility model, and it reads the signal of a speed of a motor vehicle detecting sensor output every certain sampling period, calculates the speed of automobile this moment, and compares with the speed of a motor vehicle of last time calculating; The output control signal makes the speed of a motor vehicle change display lamp work.
2, the full automatic vehicle speed of a motor vehicle according to claim 1 changes display lamp, and it is characterized in that: the operating frequency range of described microprocessor is set between the 100HZ to 5KHZ, and the sampling period is 1/4 second.
3, the full automatic vehicle speed of a motor vehicle according to claim 2 changes display lamp, it is characterized in that: the described speed of a motor vehicle changes display lamp and comprises the deceleration regime display lamp, and this deceleration regime display lamp links to each other with the data output of described microprocessor chip.
4, the full automatic vehicle speed of a motor vehicle according to claim 3 changes display lamp, it is characterized in that: the described speed of a motor vehicle changes display lamp and also comprises the acceleration mode display lamp, and this acceleration mode display lamp links to each other with another data output of described microprocessor chip.
5, the full automatic vehicle speed of a motor vehicle according to claim 4 changes display lamp, it is characterized in that: the described speed of a motor vehicle changes display lamp and also comprises the constant speed state display lamp, and this constant speed state display lamp links to each other with the another data output of described microprocessor chip.
6, change display lamp according to the claim 1 or 3 or the 4 or 5 described full automatic vehicle speed of a motor vehicle, it is characterized in that: described speed of a motor vehicle detecting sensor is the car speed sensor that automobile itself is carried, and the detection signal mouth of this car speed sensor links to each other with the data input pin of described microprocessor through the waveform arrangement of Schmidt trigger.
7, change display lamp according to the claim 1 or 3 or the 4 or 5 described full automatic vehicle speed of a motor vehicle, it is characterized in that: described speed of a motor vehicle detecting sensor is the wheel speed sensors that automobile itself is carried, and the detection signal mouth of this wheel speed sensors links to each other with the data input pin of described microprocessor through the waveform arrangement of Schmidt trigger.
8, change display lamp according to the claim 1 or 3 or the 4 or 5 described full automatic vehicle speed of a motor vehicle, it is characterized in that: described speed of a motor vehicle detecting sensor is the Hall car speed sensor, and the detection signal mouth of this Hall car speed sensor links to each other with the data input pin of described microprocessor through the aerotron amplification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420085142 CN2748336Y (en) | 2004-08-10 | 2004-08-10 | Intelligent automobile speed variation display lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420085142 CN2748336Y (en) | 2004-08-10 | 2004-08-10 | Intelligent automobile speed variation display lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2748336Y true CN2748336Y (en) | 2005-12-28 |
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ID=35719828
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420085142 Expired - Fee Related CN2748336Y (en) | 2004-08-10 | 2004-08-10 | Intelligent automobile speed variation display lamp |
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| CN (1) | CN2748336Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100488809C (en) * | 2006-11-16 | 2009-05-20 | 东风汽车有限公司 | Automobile brake lamp control method and device |
| CN102632833A (en) * | 2012-05-21 | 2012-08-15 | 周亦武 | Display device for acceleration/deceleration state of automobile |
| CN104986100A (en) * | 2015-06-05 | 2015-10-21 | 保定正源电气科技有限公司 | Speed reduction display device of automobile |
| CN107264389A (en) * | 2017-08-01 | 2017-10-20 | 孙建忠 | A kind of alarm set and vehicle |
-
2004
- 2004-08-10 CN CN 200420085142 patent/CN2748336Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100488809C (en) * | 2006-11-16 | 2009-05-20 | 东风汽车有限公司 | Automobile brake lamp control method and device |
| CN102632833A (en) * | 2012-05-21 | 2012-08-15 | 周亦武 | Display device for acceleration/deceleration state of automobile |
| CN104986100A (en) * | 2015-06-05 | 2015-10-21 | 保定正源电气科技有限公司 | Speed reduction display device of automobile |
| CN107264389A (en) * | 2017-08-01 | 2017-10-20 | 孙建忠 | A kind of alarm set and vehicle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20051228 Termination date: 20090910 |