CN1648952A - Acceleration induction automobile running record and warning device - Google Patents

Abstract

The acceleration inducing automobile run recording and warning device has senor chip, microprocessor and memory set inside mobile terminal. Gravitational force is used as one input vector in determining the acceleration and speed of automobile in both X and Y directions, and the microprocessor decoded data are transmitted to the memory. When the automobile brakes or turns abruptly in acceleration above the preset value, the automobile is judged in accident. Various data in the time interval from 55 sec before the accident to 5 sec after the accident are recorded automatically in the memory. The device may be connected to the central control system via radio signal, and when the total acceleration of the automobile exceeds the pre-warning value, the intelligent mobile terminal will send alarm to the central control system.

Description

Acceleration induction automobile running record and warning device

Technical field

The present invention relates to a kind of device that utilizes mobile intelligent terminal to write down the motoring condition data and in time traffic hazard is reported to the police.

Technical background

The present automobile consumer field that entered people as the traffic or the means of transport of ordinary populace, the security of the lives and property that simultaneously increasing traffic hazard is also threatening people.In case after traffic hazard occurring, distinguishing traffic accident responsibility becomes very important work of vehicle supervision department.Current on the other hand various mobile intelligent terminals, become indispensable important component part in people's life as palm PC PDA, mobile phone etc., if can on mobile intelligent terminal equipment, install the device of record motoring condition parameter additional, and in time send warning to vehicle supervision department and nearest hospital by radio signal on the mobile intelligent terminal equipment and GPS, this has striven for valuable time for the life that rescues the disaster victim undoubtedly, also provides foundation for distinguishing accident responsibility.Proposition of the present invention can make this imagination be achieved.

Summary of the invention

The objective of the invention is in mobile intelligent terminal (as PDA, mobile phone), to install a kind of automobile running record and warning device additional, thereby realize the state parameter of record automobile when operation easily, and traffic hazard is in time realized early warning based on acceleration induction.

The present invention is mainly by sensor chip 1, and microprocessor 2 and storer 3 are formed (as Fig. 1), the X that sensor chip 1 produces, the induction signal X of the sense of equilibrium of Y direction _OUTAnd Y _OUTBe sent to timer/timer port of microprocessor (μ P), by the induction signal X of 2 pairs of sense of equilibriums of microprocessor _OUTAnd Y _OUTDecode, and with decoded data storage in storer 3.Sensor chip 1, microprocessor 2 and storer 3 are built in mobile intelligent terminal inside, with the input vector of gravity as acceleration sensor chip 1, by (curing) computed in software, determine automobile at X, acceleration that is moved on the Y both direction and velocity magnitude, and it is synthesized total acceleration and general speed, the acceleration of this mobile intelligent terminal and speed are acceleration and the speed data of automobile when operation.Microprocessor 2 decoded acceleration and speed data are sent in the storer 3, thus the purpose of realization record motoring condition parameter.Mobile intelligent terminal is connected with central control system by radio signal, when the total acceleration of automobile during greater than early warning value (generation traffic hazard), mobile intelligent terminal sends warning to being attached thereto the central control system that connects, thereby realizes the purpose of warning in time.ADXL202E is the two dimension acceleration sensor chip, and it can be provided at X, on the Y direction with the digital signal of the proportional working cycle of acceleration (being pulse width and the ratio in cycle) as output.A microprocessor can be directly imported in this working cycle output, working cycle is counted and calculated respectively X, the acceleration on the Y direction by microprocessor.X, the working cycle of typical case's output as shown in Figure 2 on the Y direction.Among Fig. 2:

Be in the width of " on " state in T1-circulation.

The width of T2-global cycle.Variation range: by 0.5ms to 10ms.

The time of working cycle-be in " on " state (T1) accounts for the ratio of global cycle (T2).

The pulse width of pulse width-be in " on " state.

Acceleration formula:

Acceleration (g)=(T1/T2-50%)/(12.5%)

Here, 0g represents 50% working cycle.Zoom factor: 12.5% working cycle/g.

At X, on the Y both direction, output circuit can feed the timer/timer port of a microprocessor to analog signal conversion for using working cycle modulated digital signal, this digital signal, and it is counted and decodes.Timer/timer is by measuring T1, the length of T2 signal and by above-mentioned formula: acceleration (g)=(T1/T2-50%)/(12.5%) calculates acceleration.Coding/decoding method has a lot, and the method that following embodiment adopts is (shown in Figure 3 as curve), and timer begins counting from the rising edge (Ta=0) of X-axis, and record negative edge (Tb), timer stop timing when X-axis rising edge (Tc) arrival next time.T1＝Tb-Ta，T2＝Tc-Ta。For Y-axis output, do to handle equally (Td, Te, Tf).

Acceleration induction automobile running record and warning device that the present invention proposes are with the input vector of gravity as acceleration of gravity balance induction installation (sensor chip), by (curing) computed in software, thereby determine acceleration and the velocity magnitude that mobile intelligent terminal is moved.If the acceleration that makes automobile because of bringing to a halt or taking a sudden turn reaches predetermined value when above, just the various data of this device between will 55 seconds before this and back 5 seconds are charged in the storer automatically.

Description of drawings

Accompanying drawing 1 is hardware system block diagram of the present invention.

Accompanying drawing 2 is X, the working cycle curve map of typical case's output on the Y direction.

Accompanying drawing 3 is the decoding process curve map of ADXL202E chip.

Accompanying drawing 4 is embodiment A DXL202E chip pin configuration instruction figure.

Wherein: the ST-test; T2-connects R _SET, by R _SETT2 is set; The COM-common port; Y _OUTThe output of-Y passage working cycle; X _OUTThe output of-X passage working cycle; Y _FILT-Y channel filtering pin; X _FILT-X passage filtering pin; V _DD-3V is to 5.25V.

Accompanying drawing 5 is ADXL202E chip circuit figure.

Accompanying drawing 6 is the software for calculation process flow diagram

Embodiment

Below the present invention is described further by specific embodiment.

The present invention adopts the ADXL202E chip of ANALOG company as sensor chip 1, and chip pin disposes as shown in Figure 4.This chip both can be measured dynamic acceleration, can measure static acceleration again.Measurement range: ± 2g.The ADXL202E built-in chip type in mobile intelligent terminal, and is connected with the microprocessor (μ P) of mobile intelligent terminal, and the ADXL202E chip circuit as shown in Figure 5.The connection situation of eight pins of chip is: V _DDMeet 3V to the 5.25V power supply; V _DDAnd connect capacitor C between the COM _DCPlay the effect of uncoupling, C _DCRecommendation 0.1 μ F; X _FILT, Y _FILTConnect capacitor C respectively _X, C _Y, and by C _X, C _YValue the bandwidth of low-pass filter is set; T2 connecting resistance R _SETX _OUTAnd Y _OUTBe respectively X, the output on the Y direction, the timer/timer port of a microprocessor of feeding, microprocessor calculates X respectively by software, acceleration on the Y direction and speed; ST is a test lead.

The present embodiment parameter is provided with: C _DC: recommendation 0.1 μ F; T2:X, the Y direction is used the width of identical global cycle.The T2 computing formula is as follows, by different R is set _SETValue is provided with T2.

$\mathrm{<figure-callout\; id="2"\; label="T"\; filenames="A20051001317600081.png"\; state="\{\{state\}\}">T</figure-callout>}2=\frac{R_{\mathrm{SET}}\left(\mathrm{\&Omega;}\right)}{125\mathrm{M\&Omega;}}$

C _X, C _Y: by C _X, C _YThe bandwidth of low-pass filter is set.

R _FILT: representative value 32k Ω.

When the user uses when of the present invention,, perhaps simply its is with on user's body as long as mobile intelligent terminal is placed in the automobile.At first set this function of startup, at this moment the sensor chip 1 of mobile intelligent terminal inside will sense the information such as acceleration of running car, and data that sense are sent to microprocessor 2, be calculated the total acceleration of automobilism etc. by microprocessor.When automobile normal running (total acceleration of automobile does not surpass predefined acceleration alarming value), this device just is sent to storer 3 to the operational factor of automobile and preserves; When in case traffic hazard takes place (total acceleration of automobile when taking a sudden turn or bringing to a halt surpassed predefined acceleration alarming value), then this device is judged generation " accident " automatically, and the various data that accident takes place between preceding 55 seconds and back 5 seconds are charged to (action function with automobile " black box ") in the storer 3 automatically.This device can send warning to central control system by radio signal and central control system contact.Utilize the GPS of mobile intelligent terminal after automobile meets accident simultaneously, find out the emergency number nearest and also dial automatically, for medical personnel in time rescue the time of having striven for from the site of an accident.

The software for calculation workflow:

The groundwork flow process of software as shown in Figure 6.Check at first whether mobile intelligent terminal enters automobile running record and warning function, if start this function, the output X of microprocessor read transducer chip ADXL202E _OUTAnd Y _OUT, calculating X, the acceleration of Y both direction and velocity magnitude synthesize total acceleration and general speed with it, and running datas such as degree of will speed up and speed are sent to the storer preservation.Mobile intelligent terminal is connected with central control system by radio signal, when total acceleration＞certain early warning value, then be judged to be accident, mobile intelligent terminal is reported to the police to the central control system that is connected with this cover system, and sends data to nearest first-aid centre; Do not have an accident otherwise be judged to be, microprocessor continues the output of read transducer chip ADXL202E.

Beneficial effect of the present invention is, utilizes mobile intelligent terminal to reach record running car parameter and when having an accident And the function of alarm. This device is by receiving the signal of acceleration transducer, in real time the running time of registration of vehicle, Road speed, start-up time, stop off time, day tired journey, day for a long time, always tire out journey, max. speed, travel the date Etc. data; By the signal that receiving circuit transmits, record nearest 10 front 20 seconds various data of stopping and (time, drive The person of sailing, the speed of a motor vehicle) and 4 kinds of equipment states (brake, left steering, right turn, ignition switch), be transport enterprise and pipe The traffic accident of reason segment analysis provides foundation. These data of record all temporarily leave the storage with power-off protection function in In the device. This automobile running record and warning device are arranged on the individual mobile intelligent terminal, and be easy to carry, and tool Characteristics simple in structure, that operating reliability is strong are arranged. This can provide maximum help undoubtedly for processing traffic accident.

Claims (1)

1. acceleration induction automobile running record and warning device, mainly by sensor chip (1), microprocessor (2) and storer (3) are formed, sense of equilibrium's induction signal that sensor chip (1) produces is sent to the timer/timer port of microprocessor (2), by microprocessor (2) sense of equilibrium's induction signal is decoded, it is characterized in that described sensor chip (1), microprocessor (2) and storer (3) are built in mobile intelligent terminal inside, with the input vector of gravity as sensor chip (1), determine automobile at X, acceleration that is moved on the Y both direction and velocity magnitude, the decoded data of microprocessor (2) are sent to storage in the storer (3), mobile intelligent terminal is connected with central control system by radio signal, when the total acceleration of automobile during greater than early warning value, mobile intelligent terminal is reported to the police to being attached thereto the central control system that connects.

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