CN104459202A - Vehicle acceleration detecting system - Google Patents
Vehicle acceleration detecting system Download PDFInfo
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- CN104459202A CN104459202A CN201410708195.5A CN201410708195A CN104459202A CN 104459202 A CN104459202 A CN 104459202A CN 201410708195 A CN201410708195 A CN 201410708195A CN 104459202 A CN104459202 A CN 104459202A
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- acceleration
- vehicle
- modulator
- acceleration detection
- detection system
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Abstract
The invention discloses a vehicle acceleration detecting system which comprises a microcontroller module, an acceleration detecting module and a display unit, and the acceleration detecting module and the display unit are connected with the microcontroller module. The acceleration detecting module comprises a differential capacitor, a modulator, a filter and a duty ratio modulator, wherein the differential capacitor, the modulator, the filter and the duty ratio modulator are connected in sequence and are provided with polycrystalline silicon structures. The vehicle acceleration detecting system is simple in structure and can precisely measure acceleration of a vehicle.
Description
Technical field
The present invention relates to a kind of acceleration detection system, particularly relate to a kind of vehicle acceleration detection system, belong to vehicle Automatic Measurement Technique field.
Background technology
Guaranteeing the safety of driver and passenger to greatest extent when automobile meets accident collision, is one of target of auto industry pursuit.Statistics according to the Ministry of Public Health of China shows, in 1000 routine traffic hazard the wounded, only has the wounded of 14.3% to ride in ambulances in time and arrives hospital.Road traffic accident shows, if occur to adopt emergency treatment in 5min in traffic hazard, adopts emergency treatment, heavy the wounded of 18% ~ 25% at least can be made to avoid death in 30mm; In addition, in China's traffic death, the wounded of about 40% dies instantly, all the other 60% be die from hospital or be sent to hospital way in, wherein the wounded of 30% be because rescue dead not in time.Along with going deep into of automotive safety research, adopt the automobile collision protection system (as air bag etc.) that is gradually improved effectively can reduce Traffic Accident Mortality, also all kinds of corrupt practices creep in simultaneously (as can not alarm latency rescue in time etc.).
Utilize acceleration to exist to measure traffic accident generation at present, west vehicle supervision department, in order to traffic safety, has specially formulated dead this numerical value of acceleration 500g (g=10N/kg), with the people that rouses the public.If be meant to travel acceleration to exceed this value, will be in peril of one's life, so large acceleration, generally emergency brake is unapproachable, only after clashing, just can reach this numerical value.The time of vehicle collision is very short, be mostly Millisecond, and the processing speed of Atmega128 single-chip microcomputer is Microsecond grade, even has more senior chip processing speed to reach nanosecond, is enough to acceleration when calculating collision.Such as, two motorcycle speed per hour 20km (5.6m/s), go in the same direction and collide, collision time is Millisecond, calculate by 0.001s, in time short like this, the acceleration produced is a1=V/t=5.6/0.001=560g, if emergency brake, to final stopping from brake, the time calculates by 1s, and generation acceleration is a2=V/t=5.6/1=0.56g, the acceleration that visible collision produces is very big, confirms that it is feasible for judging whether to get into an accident by the method for sense acceleration.
Such as application number is a kind of vehicle brake detection table with acceleration simulation function of " 201010282877.6 ", comprise four series cylinder assembly and drum drives, front and back gearing, tensioning system, can the universal driving device of axial stretching, frame, track plate, rotation motor, lateral driver device, lengthwise movement platform, transverse movement platform, longitudinal driving device, base, TT&C system, use the present invention not only can simulated roadway and vehicle energy, measure each wheel speed and the simulation speed of a motor vehicle, and can make vehicle produce required for yaw velocity, longitudinal acceleration and transverse acceleration, the yaw of simulating vehicle, slow down and break away, for inspection vehicle ABS, EBD provides more comprehensively simulated conditions, thus make testing result can reflect vehicle ABS better, EBD control performance.
And for example application number is that apparatus for ask for help through is located in a kind of traffic accident of " 201110163240.X " automatically, comprise traffic accident sensor, temperature sensor, position locator and distress signal transmitter, traffic accident sensor is used for the state of Real-Time Monitoring air bag, generates traffic accident control signal when air bag is opened; Temperature sensor is used for Real-time Collection compartment temperature information, generates fire control signal when compartment temperature is greater than the threshold value pre-set; Position locator is used for vehicle position information to send to distress signal transmitter; Distress signal transmitter for generating emergency note, and will cry for help short message sending to associated mechanisms or individual by wireless network.Get into an accident or fire time, the present invention can send emergency note automatically, and provides vehicle position information accurately, make salvage service implement in time relief, injured litigant can be given first aid in time.
For another example application number is " 201210145683.0 " automatic car accident positioning alarm system, forms primarily of central processing unit and the GPS module be connected with central processing unit respectively, gsm module and MEMS acceleration transducer.The invention has the advantages that: this automatic positioning alarm system design adopts Atmega128 single-chip microcomputer as the central processing unit of whole system, is connected with MEMS acceleration transducer, GPS locating module, gsm communication module.Can in automatic placement of emergency calls after the occurrence of the traffic accident, inform exact position that relevant departments' traffic accident occurs, time, make it send rescue group in the very first time, striving for the more time to rescuing the wounded, saving more life.
Summary of the invention
Technical matters to be solved by this invention provides a kind of vehicle acceleration detection system for the deficiency of background technology, and its structure is simple and can accurate measure vehicle acceleration.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A kind of vehicle acceleration detection system, the acceleration detection module, the display unit that comprise micro controller module and be connected with micro controller module; Described acceleration detection module comprises the differential capacitor with polysilicon structure, modulator, wave filter, the duty cycle modulator that connect successively; Under the effect of acceleration, polysilicon structure produces skew makes the capacitance of differential capacitor change, the variable signal of differential capacitor by after modulator demodulation by filter transfer to duty cycle modulator and then be converted to the square wave that dutycycle and acceleration be directly proportional, micro controller module is shown by display unit by detection side's period of wave and then the acceleration that calculates vehicle simultaneously, is specifically calculated as a=(T
1/ T
2-U
0g) U
1g, wherein, a is the acceleration of vehicle, T
1for the ripple of square wave is wide, T
2for square wave period, U
0gfor the dutycycle that 0g is corresponding, U
1gfor the change in duty cycle value that 1g acceleration change causes.
As the further preferred version of a kind of vehicle acceleration of the present invention detection system, the model of described micro controller module is AVR series monolithic.
As the further preferred version of a kind of vehicle acceleration of the present invention detection system, described display unit is LCD display.
As the further preferred version of a kind of vehicle acceleration of the present invention detection system, described wave filter is RC wave filter.
As the further preferred version of a kind of vehicle acceleration of the present invention detection system, described acceleration detection module adopts chargeable storage to power.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
1, structure of the present invention is simple and measuring accuracy is high;
2, the present invention accurately can detect vehicle acceleration by detection;
3, the present invention is under the effect of acceleration, polysilicon structure produces skew makes the capacitance of differential capacitor change, the variable signal of differential capacitor by after modulator demodulation by filter transfer to duty cycle modulator and then be converted to the square wave that dutycycle and acceleration be directly proportional, and then calculate the acceleration of vehicle according to square wave.
Accompanying drawing explanation
Fig. 1 is structure principle chart of the present invention.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
As shown in Figure 1, a kind of vehicle acceleration detection system, the acceleration detection module, the display unit that comprise micro controller module and be connected with micro controller module; Described acceleration detection module comprises the differential capacitor with polysilicon structure, modulator, wave filter, the duty cycle modulator that connect successively; Under the effect of acceleration, polysilicon structure produces skew makes the capacitance of differential capacitor change, the variable signal of differential capacitor by after modulator demodulation by filter transfer to duty cycle modulator and then be converted to the square wave that dutycycle and acceleration be directly proportional, micro controller module is shown by display unit by detection side's period of wave and then the acceleration that calculates vehicle simultaneously, is specifically calculated as a=(T
1/ T
2-U
0g) U
1g, wherein, a is the acceleration of vehicle, T
1for the ripple of square wave is wide, T
2for square wave period, U
0gfor the dutycycle that 0g is corresponding, U
1gfor the change in duty cycle value that 1g acceleration change causes.
Wherein, the model of described micro controller module is AVR series monolithic, and described display unit is LCD display, and described wave filter is RC wave filter, and described acceleration detection module adopts chargeable storage to power.
Under the effect of acceleration, polysilicon structure can produce skew makes capacitance change.In signal processing circuit, the variable signal of differential capacitor is by passing through wave filter after modulator demodulation (by internal RF x and outside CFx, RFx is formed) deliver in duty cycle modulator, be converted to by modulator the square wave that dutycycle and acceleration be directly proportional, side wave period (T2) can be determined by Rs.This square wave can directly be delivered to single-chip microcomputer and process, and by using the width T1 of counter measures square-wave cycle T2 and arteries and veins, thus obtains the value of acceleration.Specifically be calculated as a=(T
1/ T
2-U
0g) U
1g, wherein, a is the acceleration of vehicle, T
1for the ripple of square wave is wide, T
2for square wave period, U
0gfor the dutycycle that 0g is corresponding, U
1gfor the change in duty cycle value that 1g acceleration change causes.
The control accuracy of Hyundai Motor is more and more higher, particularly in electric-control system, the performer of more previously used common switching regulators can not meet the control overflow of Modern Car, such as egr system, Wo 2009051153, fuel evaporation control system etc.Precisely, Duty ratio control should be called automatically controlled pulse modulation technology, it is the modulation by electronic-controlled installation, the voltage signal being added in certain frequency on work executive component being carried out to pulse width, and accurate to realize controlled executive component duty, continuous print controls.In fact the linear egr system that Shanghai GM Buick car adopted in recent years is exactly the linear switch function that make use of this technology thus achieve EGR valve.So why, again automatically controlled pulse modulation technology is called Duty ratio control technology, in fact, dutycycle illustrates the amplification of automatically controlled width modulation, and dutycycle refers to that in fact time that in check circuit is switched on accounts for the number percent in whole circuit working cycle.
AVR single chip has prefetched instruction function, namely when an execution instruction, in advance next instruction is got into, and call instruction can be performed within a clock period; Multiple accumulator type, data processing speed is fast; AVR single chip has 32 general purpose working registers, and being equivalent to has 32 viaducts, can fast passing; Response time is fast.AVR single chip has multiple fixing interrupt vector entry address, can respond interruption fast; AVR single chip power consumption is low.For typical power consumption situation, be 100nA when WDT closes, be more suitable for battery powered application apparatus; The minimum 1.8V of some devices gets final product work; AVR single chip security performance is good.
Structure of the present invention is simple and measuring accuracy is high; The present invention accurately can detect vehicle acceleration by detection; The present invention is under the effect of acceleration, polysilicon structure produces skew makes the capacitance of differential capacitor change, the variable signal of differential capacitor by after modulator demodulation by filter transfer to duty cycle modulator and then be converted to the square wave that dutycycle and acceleration be directly proportional, and then calculate the acceleration of vehicle according to square wave.
Those skilled in the art of the present technique are understandable that, unless otherwise defined, all terms used herein (comprising technical term and scientific terminology) have the meaning identical with the general understanding of the those of ordinary skill in field belonging to the present invention.Should also be understood that those terms defined in such as general dictionary should be understood to have the meaning consistent with the meaning in the context of prior art, unless and define as here, can not explain by idealized or too formal implication.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.By reference to the accompanying drawings embodiments of the present invention are explained in detail above, but the present invention is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, makes a variety of changes under can also or else departing from the prerequisite of present inventive concept.
Claims (5)
1. a vehicle acceleration detection system, is characterized in that: the acceleration detection module, the display unit that comprise micro controller module and be connected with micro controller module; Described acceleration detection module comprises the differential capacitor with polysilicon structure, modulator, wave filter, the duty cycle modulator that connect successively; Under the effect of acceleration, polysilicon structure produces skew makes the capacitance of differential capacitor change, the variable signal of differential capacitor by after modulator demodulation by filter transfer to duty cycle modulator and then be converted to the square wave that dutycycle and acceleration be directly proportional, micro controller module is shown by display unit by detection side's period of wave and then the acceleration that calculates vehicle simultaneously, is specifically calculated as a=(T
1/ T
2-U
0g) U
1g, wherein, a is the acceleration of vehicle, T
1for the ripple of square wave is wide, T
2for square wave period, U
0gfor the dutycycle that 0g is corresponding, U
1gfor the change in duty cycle value that 1g acceleration change causes.
2. a kind of vehicle acceleration detection system according to claim 1, is characterized in that: the model of described micro controller module is AVR series monolithic.
3. a kind of vehicle acceleration detection system according to claim 1, is characterized in that: described display unit is LCD display.
4. a kind of vehicle acceleration detection system according to claim 1, is characterized in that: described wave filter is RC wave filter.
5. a kind of vehicle acceleration detection system according to claim 1, is characterized in that: described acceleration detection module adopts chargeable storage to power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410708195.5A CN104459202A (en) | 2014-11-28 | 2014-11-28 | Vehicle acceleration detecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410708195.5A CN104459202A (en) | 2014-11-28 | 2014-11-28 | Vehicle acceleration detecting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104459202A true CN104459202A (en) | 2015-03-25 |
Family
ID=52905586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410708195.5A Withdrawn CN104459202A (en) | 2014-11-28 | 2014-11-28 | Vehicle acceleration detecting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104459202A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11167689A (en) * | 1997-12-01 | 1999-06-22 | Towa Erekkusu:Kk | Vehicle accident radio reporting system and rescue method |
| CN201765666U (en) * | 2010-08-23 | 2011-03-16 | 顾陈耀 | Automatic car accident positioning alarm controller |
| CN202075835U (en) * | 2011-06-15 | 2011-12-14 | 山东交通学院 | Device for automatically calling for help in case of vehicle traffic accident |
| CN103390326A (en) * | 2012-05-11 | 2013-11-13 | 四川优的科技有限公司 | Car accident automatic positioning and alarming system |
-
2014
- 2014-11-28 CN CN201410708195.5A patent/CN104459202A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11167689A (en) * | 1997-12-01 | 1999-06-22 | Towa Erekkusu:Kk | Vehicle accident radio reporting system and rescue method |
| CN201765666U (en) * | 2010-08-23 | 2011-03-16 | 顾陈耀 | Automatic car accident positioning alarm controller |
| CN202075835U (en) * | 2011-06-15 | 2011-12-14 | 山东交通学院 | Device for automatically calling for help in case of vehicle traffic accident |
| CN103390326A (en) * | 2012-05-11 | 2013-11-13 | 四川优的科技有限公司 | Car accident automatic positioning and alarming system |
Non-Patent Citations (1)
| Title |
|---|
| 顾陈耀等: "车祸自动定位报警系统的设计与实现", 《电子设计工程》 * |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| C04 | Withdrawal of patent application after publication (patent law 2001) | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20150325 |