CN201974525U - Vehicle distance early warning system - Google Patents
Vehicle distance early warning system Download PDFInfo
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- CN201974525U CN201974525U CN2011200202560U CN201120020256U CN201974525U CN 201974525 U CN201974525 U CN 201974525U CN 2011200202560 U CN2011200202560 U CN 2011200202560U CN 201120020256 U CN201120020256 U CN 201120020256U CN 201974525 U CN201974525 U CN 201974525U
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Abstract
The utility model discloses a vehicle distance early warning system, which comprises a power unit, a sensor unit, an automatic control unit, and an alarming unit. The sensor unit and the alarming unit are respectively connected with the automatic control unit; and the sensor unit, the alarming unit and the automatic control unit are respectively connected with the power unit. The vehicle distance early warning system adopts the automatic control unit to drive an ultrasonic transmission circuit to transmit ultrasonic, and the ultrasonic transmission drive mode is more accurate than that of hardware circuit drive in the prior art and has stronger reliability; and the automatic control unit can automatically take measures to control the running state of vehicles, and lead the driving to be safer and more reliable. The circuit design of the vehicle distance early warning system has excellent energy saving performance, low power, and is convenient to use. The vehicle distance early warning system can be broadly applied to various vehicles.
Description
Technical field
The utility model belongs to Vehicular intelligent chemical control system field, is specifically related to a kind of vehicle distances early warning system.
Background technology
Intelligent vehicle control is the forward position of current Vehicle Engineering technical field, and it has embodied Vehicle Engineering, information engineering, electronic technology, the intersection of a plurality of fields such as computer technology theory and practice.The extensive application of intelligent control technology aspect vehicle makes vehicle in automatic control, and there has been tangible progress aspects such as driving safety, further promotes the vehicle control technology towards robotization, intellectuality, and hommization, the direction of security develops.In view of the raising of present Vehicle Speed, the maintenance of the normal spacing of vehicle seems more and more important.Therefore, studying a kind of SCM Based vehicle distances early warning system is necessary.
Summary of the invention
The purpose of this utility model is, a kind of vehicle distances early warning system based on the HCS12 single-chip microcomputer is provided.The whether suitable problem of object distance when this system can solve vehicle ' and on front vehicles or the road, when distance that control module is calculated by the sensor unit input signal and front vehicles distance less than present speed under during safe stopping distance, control module drives the buzzer warning prompting, remind the driver to take corresponding measures such as deceleration according to warning message, keep necessary spacing, realize the vehicle distances early warning.
To achieve these goals, the utility model adopts following technical scheme to be achieved:
A kind of vehicle distances early warning system is characterized in that, comprises power supply unit, sensor unit, automatic control unit and alarm unit; Described sensor unit, alarm unit are connected with described automatic control unit respectively, described sensor unit, and alarm unit is connected described power supply unit respectively with automatic control unit.
The utility model also comprises following other technical characterictic:
Described power supply unit comprises battery, and described battery is connected with Voltage stabilizing module and boost module.
Described battery adopts 7.2 volts of Ni-Cd nickel-cadmiums.
Described sensor unit comprises transmitting transducer and ultrasonic receiver.
Described alarm unit comprises piezo buzzer at least.
Described automatic control unit adopts the MC9S12XDP512 single-chip microcomputer.
Advantage of the present utility model:
1, drive ultrasonic transmit circuit emission ultrasound wave by automatic control unit, it is more accurate to drive emission than hardware circuit in the prior art, and reliability is stronger.
2, by the auxiliary management of automatic control unit vehicle ', when vehicle distances is too small, automatic control unit will take measures to control vehicle running state voluntarily, slow down by force or stop, make that driving is more safe and reliable.
3, circuit design good energy saving property, power is little, and is easy to use, can be widely used in various vehicles, particularly under the drunk this pattern of driving, driver assistance function automatically arranged better.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is the schematic diagram of power supply unit.Wherein, (a) being Voltage stabilizing module, (b) is boost module.
Fig. 3 is sensor unit schematic diagram figure.Wherein, (a) be ultrasonic transmit circuit figure, (b) ultrasound wave is receiving circuit figure.
Fig. 4 is the alarm unit schematic diagram.
Fig. 5 is the pin elementary diagram of automatic control unit.
Below in conjunction with the drawings and specific embodiments the utility model is done further and to be explained.
Embodiment
With reference to Fig. 1, vehicle distances early warning system of the present utility model comprises power supply unit, sensor unit, automatic control unit and alarm unit; Sensor unit, alarm unit is connected with automatic control unit respectively, sensor unit, alarm unit is connected power supply unit respectively with automatic control unit.
Power supply unit comprises battery, and described battery is connected with Voltage stabilizing module and boost module.Battery adopts 7.2 volts of Ni-Cd nickel-cadmiums.With reference to Fig. 2 (a), Voltage stabilizing module adopts the LT1084-5 stabilivolt, pin ground connection in the middle of the LT1084-5,7.2 volts of positive sources of input termination, input end is through 330 microfarad capacity earths, and output terminal is through 330 microfarad capacity earths, and output terminal is 5 volts, give control module, the ultrasound wave receiving circuit power supply in alarm unit and the sensor unit.With reference to Fig. 2 (b), boost module is by LT1070,100 microhenry inductance L 1, diode IN5819, stabilivolt 7815 constitutes, 1 pin of LT1070 connects 1 microfarad capacity earth through 1K resistance, 2 pin of LT1070 are through the 1.24K resistance eutral grounding, 2 pin connect the positive pole of 330 microfarad electric capacity, C6 (330 microfarad) electric capacity minus earth through 18.7K resistance, 3 pin of LT1070 are unsettled, 5 pin of LT1070 are through 4 pin of 100 microhenry inductance connection LT1070, and 4 pin are through the positive pole of diode IN5819 connection C6 (330 microfarad) electric capacity, and the positive pole of C6 (330 microfarad) electric capacity connects the input end of voltage stabilizing chip 7815,7815 output terminal connects the positive pole of C7 (330 microfarad) electric capacity, C7 (330 microfarad) minus earth, 7815 output terminal be output as+and 15 volts, be the ultrasonic transmit circuit power supply of sensor unit.
Sensor unit comprises transmitting transducer and ultrasonic receiver.With reference to Fig. 3 (a), ultrasonic transmit circuit is made up of a 9013NPN triode and transmitting transducer.In the ultrasonic transmit circuit, the IO mouth of automatic control unit (PA0 mouth) is connected with 10K Europe resistance, be connected with 10K resistance on the base stage of 9013NPN type triode 9013, + 15 volts of voltages are connected with transistor collector through 470 Europe resistance, transistor collector is connected with transmitting transducer 1 pin through 100 microfarad electric capacity, the same ground connection of emitting stage of 2 pin of transmitting transducer and triode.After the IO mouth output earth signal process triode amplification by automatic control unit, the driving transmitting transducer sends the ultrasound wave with automatic control unit output signal same frequency.
With reference to Fig. 3 (b), the ultrasound wave receiving circuit is made up of 9013NPN type triode and LM393 operational amplifier.In the ultrasound wave receiving circuit, the ultrasonic receiver signal end is connected with transistor base through 104 microfarad electric capacity, be connected 100K Europe resistance between transistor base and the collector, transistor base is through 10K Europe rheochord ground connection, transistor emitter ground connection, VCC (+5 volts) connects transistor collector through 2K Europe current-limiting resistance, transistor collector is connected with the normal phase input end of LM393 through 104 microfarad electric capacity, the inverting input of LM393 connects the middle pin of 100K Europe rheochord, two other pin of line rheostat connects VCC and ground respectively, VCC is through the output terminal of 4.7K Europe resistance connection LM393, and output terminal is connected with automatic control unit PA7.Ultrasound wave has decay in transmittance process, the signal that receives is for the millivolt level, and is fainter, and in order effectively to utilize echoed signal, so with 9013NPN type triode it is amplified, the bias voltage of regulating triode by 100K Europe line rheostat makes it conducting.Be about 3 volts through the signal after amplifying, LM393 comparator reference voltage is selected 2 volts, and signal is 5 volts a square-wave signal for peak-to-peak value voltage relatively afterwards, and Input Control Element PA7 mouth supplies control module to detect this signal.
With reference to Fig. 4, alarm unit adopts piezo buzzer.In the circuit diagram of hummer, 1 pin of IR2304 connects the PB1 of control module, this is the drive signal receiving end, 2 pin and 4 pin ground connection, and 3 pin connect+5 volts of voltages, 5 pin connection R2(30 Europe) back connects 1 pin of IRL3803, the 3 pin ground connection of IRL3803,2 pin of IRL3803 connect the input end of piezo buzzer, VCC(+5 volt) power to piezo buzzer, VCC is through 8 pin of IN5819 connection IR2304, and 6 pin connect 8 pin through 104 microfarad electric capacity.
MC9S12XDP512 in the HCS12 series monolithic that automatic control unit employing Freescale company produces, it is the microprocessor of 16 bit of a high-performance, low-power consumption, inside is integrated a plurality of universal I interfaces, enhancement mode seizure timer module.Saved external circuit design and software and realized, made that detection and warning are more accurate.This single-chip microcomputer has stronger interrupt handling capacity, has a plurality of external trigger and interrupts input pin, helps the accurate switch of external interrupt.With reference to Fig. 5, ultrasonic transmit circuit is connected with the IO mouth PA0 of automatic control unit, and the ultrasound wave receiving circuit is connected with automatic control unit IO mouth PA7.Hummer is connected with the PB1 mouth of automatic control unit.PA0 mouth driving transmitting transducer by automatic control unit carries out ultrasonic emitting, the opening timing device interrupts simultaneously, interrupt the inside and carry out timing, ultrasonic emitting after the front vehicles tail end fire back, accept by the ultrasound wave receiving device, this signal process is amplified, can get Transistor-Transistor Logic level after the comparison process, produce a hopping edge, with this hopping edge Input Control Element PA7 mouth, control module is closed interruption after detecting this signal, obtain the duration of interruption, this time is the emission ultrasound wave and receives hyperacoustic mistiming t1, current distance Got_s=t1*speed/2, wherein, Got_s is the distance that obtains, and speed is aerial velocity of propagation 340 m/s of ultrasound wave.
During practical application, ultrasonic emitting module in the sensor unit and ultrasound wave are accepted the front end that module is installed in vehicle, when vehicle began to travel, this vehicle early warning system started working.Automatic control unit drives ultrasound wave and produces signal and emission, open a timer simultaneously and interrupt, this timer interrupts picking up counting, when automatic control unit receives the signal that ultrasonic receiver produces, close this interruption, interrupt obtaining the mistiming by timer.The real-time reception of automatic control unit is installed in vehicle front signal that sensor unit sends, according to the mistiming of launching and accept the ultrasound wave generation, calculate and the front vehicles distance, and with this distance and the comparison of vehicle present speed safety braking bee-line, as less than braking distance, then automatic control unit drives buzzer warning, and the prompting driver takes the necessary measures, keep and the necessary distance of front vehicles, realize apart from early warning.The utlity model has easy to makely, circuit design is simple, response fast, precise control, characteristics such as cost is low.
Claims (6)
1. a vehicle distances early warning system is characterized in that, comprises power supply unit, sensor unit, automatic control unit and alarm unit; Described sensor unit, alarm unit are connected with described automatic control unit respectively, described sensor unit, and alarm unit is connected described power supply unit respectively with automatic control unit.
2. vehicle distances early warning system as claimed in claim 1 is characterized in that described power supply unit comprises battery, and described battery is connected with Voltage stabilizing module and boost module.
3. vehicle distances early warning system as claimed in claim 1 is characterized in that, described battery adopts 7.2 volts of Ni-Cd nickel-cadmiums.
4. vehicle distances early warning system as claimed in claim 1 is characterized in that described sensor unit comprises transmitting transducer and ultrasonic receiver.
5. vehicle distances early warning system as claimed in claim 1 is characterized in that described alarm unit comprises piezo buzzer at least.
6. vehicle distances early warning system as claimed in claim 1 is characterized in that, described automatic control unit adopts the MC9S12XDP512 single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200202560U CN201974525U (en) | 2011-01-21 | 2011-01-21 | Vehicle distance early warning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200202560U CN201974525U (en) | 2011-01-21 | 2011-01-21 | Vehicle distance early warning system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201974525U true CN201974525U (en) | 2011-09-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200202560U Expired - Fee Related CN201974525U (en) | 2011-01-21 | 2011-01-21 | Vehicle distance early warning system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201974525U (en) |
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2011
- 2011-01-21 CN CN2011200202560U patent/CN201974525U/en not_active Expired - Fee Related
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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: 20110914 Termination date: 20120121 |