CN101226056A - Car body obliqueness detection voice alarm device based on CAN bus - Google Patents
Car body obliqueness detection voice alarm device based on CAN bus Download PDFInfo
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- CN101226056A CN101226056A CNA2007100999580A CN200710099958A CN101226056A CN 101226056 A CN101226056 A CN 101226056A CN A2007100999580 A CNA2007100999580 A CN A2007100999580A CN 200710099958 A CN200710099958 A CN 200710099958A CN 101226056 A CN101226056 A CN 101226056A
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Abstract
The invention provides a voice alarming device based on CAN bus for vehicle drift angle detection, which relates to a related field of automobile driving safety. The voice alarming device comprises an acceleration transducer, a micro-controller and a voice alarming device with loudspeaker, a CAN driver and a vehicle CAN bus. The output port of the acceleration transducer is connected with an AD port of the micro-controller; one IO port of the micro-controller is connected with the voice alarming device with loudspeaker; the CAN communication interface of the micro-controller is connected with a vehicle CAN bus communication network through the CAN driver; the other IO port of the micro-controller is connected with a display device. The voice alarming device with loudspeaker is connected with a microphone. A USART port of the micro-controller is also connected with a serial communication driver. The voice alarming device can implement judgement and alarm in the hazardous condition of parking in a traffic slope, thereby the voice alarming device can be effective in preventing accidents from taking place and improve the driving safety performance of the vehicle.
Description
Technical field
A kind ofly relate to the automotive safety technical field, relate in particular to running car active safety equipment association area based on CAN bus car body obliqueness detection voice alarm device.
Background technology
Automobile has become transport facility easily and efficiently, has occupied considerable status in politics, economy, the social life every field of human society.Made huge contribution for the progress of human expanding economy and society, automobile has become human civilization and one of the symbol that improves and sign.But its negative effect traffic hazard has been global serious social concern.According to relevant report, since motor vehicle road traffic accident death record was arranged, ten thousand people died from road traffic accident surplus the whole world had 3200.2000, because of the road traffic accident number of being in hospital of sustaining a severe injury reaches 5,000,000 people every year, injured total number of persons reached 3,000 ten thousand people.Come out 100 for many years from automobile, existing more than 2,500 ten thousand people that die because of traffic hazard in the whole world, what disable reaches 4～500,000,000 people.
Along with growth in the living standard, automobile has stepped into common Chinese family, drive and by bus safety become in the daily life of many people the major issue that must face.Simultaneously, along with the development and progress of auto industry self, people are except, especially also having higher requirement aspect vehicle safety more and more the strictness in the requirement of aspects such as the dynamic property of automobile, economy, discharging.The technology that what use is made of is advanced now produces the safety automobile more thoughtful to passenger protection more, one of urgent task that has become each big automobile vendor and faced.
Vehicle safety generally is divided into security and ecological security after active safety, passive safety, the accident.Vehicle active safety is meant that automobile itself prevents or reduce the performance of road traffic accident generation.Depend primarily on overall dimension, braking, riding stability, maneuverability, informedness and driver's condition of work of automobile.Wherein driver's condition of work is a significant effects factor.The principal element that influences the trap for automobile traffic safety comprises people, automobile, road and transport environmental condition.Can think that traffic safety is main relevant with " driver-automobile-road " system.Wherein human factor influence just is meant the especially weakness on driver's state unfavorable condition, personality and the muscle power or lack experience or the like of the traffic person of participating in directly.
From the active safety aspect, driver's driving condition is a key factor that influences vehicle safety travel.Border investigation factually is in the driver drives vehicle process, because the accident of Parking generation is of common occurrence on the slope.When vehicle is in the parking of slope position positions especially in easy flights, owing to the sliding phenomenon of vehicle under action of gravity that driver's carelessness does not take effective brake measure (for example parking brake) to cause, brought serious potential safety hazard for driver and passenger.
According to safe driving knowledge, when the driver need should carry out following three basic security measures when slope position stops:
(1) variator can not place the neutral position.
(2) confirm that parking brake is in home.
(3) use extraneous ancillary method to prevent vehicle slip.
Yet from accident experience and the factual survey that has taken place, most of stopping on hill belongs to temporary parking or special circumstances are stopped.This moment, the driver handled other things owing to get off temporarily, tend to neglect and take corresponding safety practice, do not note tending to cause serious accident slightly, and owing to the reason of the technology of automobile own seldom occurs, this is because the driver tends to be subjected to the influence of following factor when stopping:
(1) driver is stopped, and notice has been transferred on the thing that will do, is easy to carelessness and forgets measures such as taking the pull-up parking brake.
(2) road surface that judges of the situation in a lot of highway sections in easy flights tilts difficultly, and the driver is probably owing to recognize the road surface and do not tilt, thereby causes the accident.
(3) for long driver of running time, tend to take corresponding safety practice because of stopping to ignore in the highway section, slope, cause the accident.
At above analysis, driver's factor analysis from vehicle active safety, travel, stay the security that stops in order to improve automobile in the highway section, slope, help the driver to find that slope situation and the use of reminding the driver rationally to handle safety practices such as parking brake are very necessary.This device utilizes acceleration analysis and CAN bussing technique, monitor by inclination angle and other parameters vehicle body, and utilize nerual network technique to judge vehicle ramp parking situation, do not carry out voice prompt alarm to take the driver of corresponding safety practice in stopping on hill.Do not handle the driver under the situation of warning, can report to the police from trend vehicle master control ECU (Electronic Control Unit, electronic control unit descend together), for support vehicles safety is taked further step, form the vehicle state monitoring equipment of an intelligence.This device not only can reduce the stopping on hill possibility of accident occurrence greatly, also can be used as car dynamics test equipment and uses, and has extensive market prospects.
Summary of the invention
The objective of the invention is at vehicle in the not enough situation of slope active safety monitoring in the stopping time, by expansion to the vehicle CAN communication network, utilize acceleration analysis technology, microcontroller technology, CAN bus communication technology, neural network computing technique, technology of serial communication and voice storage play-back technology etc. construct the intelligent sound warning device that can be used for automobile body pitch angle and acceleration monitor.Can monitor the pitch angle and the acceleration of the horizontal vertical both direction of vehicle, and detect the important parameter of all the other vehicle ' by the CAN bus, by neural network computing technique identification vehicle running state, be in dangerous slope at vehicle and when stopping situation, report to the police to driver and vehicle master control ECU.This intelligent apparatus reduces vehicle driving safety hidden danger to preventing the generation of this type of accident, and improving vehicle active safety can have very big meaning.
A kind of this device comprises acceleration transducer based on CAN bus car body obliqueness detection voice alarm device, microcontroller, the audio alert equipment of band loudspeaker, CAN driver, car load CAN bus and display device;
The output port of acceleration transducer links to each other with the digital-to-analog conversion of described microcontroller (AD) port;
An output (IO) port of described microcontroller links to each other with the phonetic alarm device of band loudspeaker;
The CAN communication interface of described microcontroller links to each other with car load CAN bus communication network by described CAN driver;
Another output (IO) port of described microcontroller links to each other with display device.
A kind of based on CAN bus car body obliqueness detection voice alarm device, this audio alert equipment that installs described band loudspeaker also is connected with a microphone.
A kind of based on CAN bus car body obliqueness detection voice alarm device, this USART port that installs described microcontroller also is connected with a serial communication driver.
When vehicle ',, carry out obtaining real-time vehicle body acceleration data after digital-to-analog conversion is handled through described microcontroller by described acceleration transducer collection vehicle side direction and vertical real time acceleration simulating signal.The CAN communication interface of microcontroller links to each other with car load CAN bus communication network by described CAN driver in addition, obtain vehicle speed by the CAN communication network from master control ECU, engine speed, Transmission gear, vehicle transport condition parameters such as parking brake position, in conjunction with the vehicle body acceleration data that obtain, by the neural network computing technique, thereby judge the current vehicles state, when calculating finds that vehicle is in dangerous slope Parking situation, report to the police to the driver by described language alarm equipment, report to the police to master control ECU by described CAN bus communication network.And, show monitor data in real time to vehicle by described display device realization human-computer interaction interface, and cooperate phonetic alarm device simultaneously, realize that the user records self-defined alarm content interface.
In addition, the serial communication system that constitutes by microcontroller and described serial communication driver provides test interface for technology and scientific research personnel, can carry out the real-time control and measuring test of vehicle acceleration of overall process.
Described neural network computing method run on described microcontroller, adopt double-deck neuron perceptron network, to acceleration information and the vehicle speed that obtains by the CAN bus, engine speed, Transmission gear, vehicle transport condition parameters such as parking brake position are handled, and judge current travel condition of vehicle, when result of calculation shows that vehicle is in the hole, send warning signal.
The present invention utilizes acceleration analysis technology and CAN bus communication technology, vehicle running state is monitored in real time, and based on calculating model of neural networks vehicle running state is discerned, when being in dangerous situation, vehicle reports to the police to driver and vehicle master control ECU; In addition, this device shows current vehicle monitoring data and provides the control and measuring interface by technology of serial communication to the tester to have the user and record self-defined alarm content function to the driver in real time by human-computer interaction interface.
This warning device can be stayed the precarious position stop to the driving slope and judged and report to the police, and experiment showed, that this device can improve driver's vigilance of stopping effectively, trouble-saving generation, reduce vehicle driving safety hidden danger, improve the vehicle active safety energy, reached its intended purposes.
Description of drawings
Fig. 1 is an inclination of vehicle angular measurement principle schematic of the present invention.
Fig. 2 is a structural representation of the present invention.
Fig. 3 is apparatus of the present invention control program schematic flow sheet.
Fig. 4 is a neural network computing method synoptic diagram of the present invention.
Fig. 5 is a serial test interface host computer monitoring software synoptic diagram of the present invention.
Fig. 6 is the self-defined warning recording of the present invention control flow chart.
Embodiment
Below in conjunction with description of drawings the present invention.
Fig. 1 is an inclination of vehicle angular measurement principle schematic of the present invention.When vehicle is in the slope, its suffered acceleration of gravity can be decomposed into perpendicular to plane, slope and two components that are parallel to the plane, slope, therefore as long as detect the horizontal component of its acceleration of gravity, be in halted state or at the uniform velocity under the state, just can obtain body sway angle α at vehicle by corresponding triangle formula.Therefore only need to arrange that an acceleration transducer to the transverse axis acceleration sensitive can obtain actual car body obliqueness, but needing to distinguish this acceleration is vehicle normal acceleration or acceleration of gravity, so still need other vehicle running state parameter comprehensively to judge except acceleration information.These parameters can be provided by vehicle master control ECU, obtain by the CAN bus.
As shown in Figure 2, Fig. 2 is a structural representation of the present invention.Comprise acceleration transducer, microcontroller, the audio alert equipment of band loudspeaker, CAN driver, car load CAN bus and display device; The output port of acceleration transducer links to each other with the digital-to-analog conversion of described microcontroller (AD) port; An output (IO) port of described microcontroller links to each other with the phonetic alarm device of band loudspeaker; The CAN communication interface of described microcontroller links to each other with car load CAN bus communication network by described CAN driver; Another output (IO) port of described microcontroller links to each other with display device.
Described acceleration transducer acquired signal carries out obtaining real-time vehicle body acceleration data after digital-to-analog conversion is handled through described microcontroller.Microcontroller is by obtaining vehicle speed, engine speed, Transmission gear from car load CAN bus in addition, vehicle transport condition parameters such as parking brake position, in conjunction with the vehicle body acceleration data that obtain,, thereby judge the current vehicles state by the neural network computing technique; When calculating finds that vehicle is in dangerous slope Parking situation, report to the police to the driver by described language alarm equipment, report to the police to master control ECU by car load CAN bus.And, show monitor data in real time to vehicle by described display device realization human-computer interaction interface, and cooperate phonetic alarm device simultaneously, realize that the user records self-defined alarm content interface.In addition, the serial communication system that constitutes by microcontroller and described serial communication driver provides test interface for technology and scientific research personnel, can carry out the real-time control and measuring test of vehicle acceleration of overall process.
The ADXL311 biaxial type acceleration transducer that described acceleration transducer sensors A DI company produces, concrete parameter is of a size of 5 * 5 * 2mm, adopting the dual axis accelerometer simulation output of 8 pins sealings LCC encapsulation, can measure dynamically and static acceleration, typical measurement range is-2g～+ 2g.Minimum supply voltage 3V, single shaft power consumption 200mA, pink noise 300ug/sqrt-Hz.This double-axel acceleration sensor is respectively to XY axle two vertical direction sensitivities, and when 5V powered, 0g acceleration output valve was 2.5V, and measurement sensitivity is 312mV/g, can well satisfy measurement requirement.
8 single-chip microcomputers of PIC18F458 type that described microcontroller is produced for Microchip company, its built-in ten accuracy A D converters satisfy the requirement of gathering the output acceleration signal.The built-in CAN controller of this microcontroller can directly insert the CAN bus by the CAN bus driver as the single-CAN node.By microcontroller is developed, the analog acceleration signal that described acceleration transducer is produced carries out digital-to-analog conversion, can obtain actual car body obliqueness value.After other data that combination obtains by the CAN bus to the car body obliqueness value are carried out the neural network computing, can realize the vehicle-state judgement, the driver warns, data is sent to by the CAN bus functions such as car load master control ECU.
Described audio alert equipment is the high-quality monolithic speech recording and reproducing ISD1420 speech chip that American I SD company produces.Recording substance deposits the permanent storage unit in, the zero energy information stores is provided, voice and sound signal are directly stored, and enter eeprom memory with its analog form originally, and the direct modeling storage allows to use a kind of monolithic solid circuit methods to finish its reproduction of voice originally.Not only voice quality is winning, and the protection of outage voice.Cooperate by this chip and described microcontroller, be implemented under the different driving states and carry out audio alert and the function of recording self-defined alarm content to the driver.For example be 3 degree when stopping, by the voice suggestion driver that wife driver recorded: " please note and drawn parking brake at the inclination angle! ".
The CAN driver PCA82C250 that described CAN communication driver adopts PHILIPS company to produce.In order to eliminate the interference in the CAN signal, adopt optic coupling element to carry out Signal Spacing.
Described serial communication driver adopts the level conversion of the MAX232 chip of MAXIM company as the RS232 communication, uses RS232 serial protocol and computing machine to carry out communication, realizes real-time experimental test interface.
Described liquid crystal display adopts the dot character type LCD based on the HD44780 liquid-crystal controller, controls the realization human-computer interaction interface by described microcontroller.
Can be divided into following three kinds of mode of operations according to different this intelligent alarm devices of function:
Security monitoring alarm mode: this device is installed on the meter panel of motor vehicle position, as a node access car load network of CAN bus.Behind the starting outfit, the security monitoring program is according to control program schematic flow sheet operation as shown in Figure 3.System at first carries out each peripherals such as acceleration transducer, audio alert equipment, LCD etc. are carried out self check, as pinpoints the problems and promptly give the alarm, and reports that this intelligent alarm device lost efficacy.After the self check success, program enters circulation security monitoring alarm mode, and microcontroller reads acceleration transducer collection value, obtains all the other necessary vehicle running state parameters from the CAN bus simultaneously.Judge that by comprehensive all parameters that obtain of neural network computing method as shown in Figure 4 current acceleration are normal vehicle acceleration or dangerous stopping on hill pitch angle then, comprise vertically and the lateral angles detection.When finding that vehicle is in the hole, report to the police to the driver by phonetic alarm device, report to the police to master control ECU by the CAN bus simultaneously.All real-time monitor datas all will show by LCD liquid crystal display man-machine interface, be delivered to master control ECU by the CAN bus, be submitted to external test interface by serial protocol.
The experimental test monitoring mode: except using as car security alarm device, this device also can be used as the automobile test research equipment and uses.This device is installed on the meter panel of motor vehicle position, be connected to computing machine by its serial test interface, utilize the testing software of corresponding exploitation can realize real-time monitoring, storage, analyze current vehicle ' vertically and the function of side acceleration data, be illustrated in figure 5 as the computer monitoring software interface synoptic diagram in the test.In addition, the security monitoring warning function is in running status simultaneously when using this function, and both do not interfere with each other.
Self-defined warning recording mode: this intelligent alarm device has self-defined warning sound-recording function.From the psychology angle, the people is often aroused attention by its people who gets close to or the sound of oneself than being easier to." brake is noted in danger for self-defined wife who records or the alarm voice of oneself for example! " often more effectively remind the driver to take measures to prevent dangerous generation than the machine-made warning tone of predefine.Be illustrated in figure 6 as self-defined warning recording control flow chart, after the user presses self-defined warning record button, the recording beginning, the user uses when EEPROM waits to report to the police by being stored in after the digital-to-analog conversion by the self-defining alarm voice of microphone typing.
By above embodiment, can see that the present invention can be integrated in the car load safety control system at an easy rate, and have following significant advantage:
(1) can stay the precarious position stop to the driving slope and judge and reports to the police, can improve driver's vigilance of stopping effectively, to trouble-saving generation, reduce vehicle driving safety hidden danger, the raising vehicle active safety can have very big meaning.
(2) can be used as the scientific research testing equipment and use, can be to vehicle side to monitoring with longitudinal acceleration, storage is analyzed.Because equipment has very strong travelling performance, can be applied to quickly and easily in the different vehicle tests.
(3) platform has versatility, can be integrated into as required in the different systems, is not limited to the exploitation of vehicle active safety equipment, is with a wide range of applications.
Claims (9)
1. one kind based on CAN bus car body obliqueness detection voice alarm device, it is characterized in that this device comprises acceleration transducer, microcontroller, the audio alert equipment of band loudspeaker, CAN driver, car load CAN bus and display device;
The output port of acceleration transducer links to each other with the digital-to-analog conversion of described microcontroller (AD) port;
An output (IO) port of described microcontroller links to each other with the phonetic alarm device of band loudspeaker;
The CAN communication interface of described microcontroller links to each other with car load CAN bus communication network by described CAN driver;
Another output (IO) port of described microcontroller links to each other with display device.
2. according to claim 1 a kind ofly it is characterized in that based on CAN bus car body obliqueness detection voice alarm device, described acceleration transducer is the ADXL311 biaxial type acceleration transducer that ADI company produces.
3. according to claim 1 a kind ofly it is characterized in that based on CAN bus car body obliqueness detection voice alarm device, described microcontroller is 8 single-chip microcomputers of PIC18F458 type that Microchip company produces.
4. according to claim 1 a kind ofly it is characterized in that based on CAN bus car body obliqueness detection voice alarm device, the audio alert equipment of described band loudspeaker is the monolithic speech recording and reproducing ISD1420 speech chip that American I SD company produces.
5. according to claim 1 a kind ofly it is characterized in that based on CAN bus car body obliqueness detection voice alarm device, the CAN driver PCA82C250 that described CAN communication driver adopts PHILIPS company to produce.
6. according to claim 1ly a kind ofly it is characterized in that based on CAN bus car body obliqueness detection voice alarm device described display device is the dot character type LCD based on the HD44780 liquid-crystal controller.
7. according to claim 1ly a kind ofly it is characterized in that based on CAN bus car body obliqueness detection voice alarm device the audio alert equipment of described band loudspeaker also is connected with a microphone.
8. according to claim 1ly a kind ofly it is characterized in that based on CAN bus car body obliqueness detection voice alarm device the USART port of described microcontroller also is connected with a serial communication driver.
9. according to claim 1ly a kind ofly it is characterized in that the MAX232 chip that described serial communication driver is a MAXIM company based on CAN bus car body obliqueness detection voice alarm device.
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| CNA2007100999580A CN101226056A (en) | 2007-06-01 | 2007-06-01 | Car body obliqueness detection voice alarm device based on CAN bus |
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| CNA2007100999580A CN101226056A (en) | 2007-06-01 | 2007-06-01 | Car body obliqueness detection voice alarm device based on CAN bus |
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| CN101226056A true CN101226056A (en) | 2008-07-23 |
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| CNA2007100999580A Pending CN101226056A (en) | 2007-06-01 | 2007-06-01 | Car body obliqueness detection voice alarm device based on CAN bus |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101884439A (en) * | 2010-07-08 | 2010-11-17 | 西北工业大学 | Intelligent mountain bike helmet and realization method thereof |
| CN102589896A (en) * | 2012-01-12 | 2012-07-18 | 浙江师范大学 | State testing equipment for automobiles |
| CN103702884A (en) * | 2011-08-12 | 2014-04-02 | 迪尔公司 | Method and system for determining the tilt of a vehicle |
| CN105599676A (en) * | 2016-01-22 | 2016-05-25 | 中通客车控股股份有限公司 | Electric vehicle parking indicating and alarming system and operating method |
| CN106156845A (en) * | 2015-03-23 | 2016-11-23 | 日本电气株式会社 | A kind of method and apparatus for building neutral net |
| CN106791075A (en) * | 2016-12-16 | 2017-05-31 | 广东美晨通讯有限公司 | A kind of method and device of prompting |
| CN107924484A (en) * | 2015-07-23 | 2018-04-17 | 丰田汽车欧洲股份有限公司 | For the system and computer based method in environmental background Imitating class people's controlling behavior |
| CN112113774A (en) * | 2020-06-30 | 2020-12-22 | 上汽通用五菱汽车股份有限公司 | Ramp detection method, detection terminal and storage medium |
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2007
- 2007-06-01 CN CNA2007100999580A patent/CN101226056A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101884439A (en) * | 2010-07-08 | 2010-11-17 | 西北工业大学 | Intelligent mountain bike helmet and realization method thereof |
| CN101884439B (en) * | 2010-07-08 | 2012-07-25 | 西北工业大学 | Intelligent mountain bike helmet and realization method thereof |
| CN103702884A (en) * | 2011-08-12 | 2014-04-02 | 迪尔公司 | Method and system for determining the tilt of a vehicle |
| CN103702884B (en) * | 2011-08-12 | 2016-08-31 | 迪尔公司 | For determining the method and system at vehicle inclination angle |
| CN102589896A (en) * | 2012-01-12 | 2012-07-18 | 浙江师范大学 | State testing equipment for automobiles |
| CN106156845A (en) * | 2015-03-23 | 2016-11-23 | 日本电气株式会社 | A kind of method and apparatus for building neutral net |
| CN107924484A (en) * | 2015-07-23 | 2018-04-17 | 丰田汽车欧洲股份有限公司 | For the system and computer based method in environmental background Imitating class people's controlling behavior |
| CN105599676A (en) * | 2016-01-22 | 2016-05-25 | 中通客车控股股份有限公司 | Electric vehicle parking indicating and alarming system and operating method |
| CN105599676B (en) * | 2016-01-22 | 2018-05-25 | 中通客车控股股份有限公司 | A kind of electric vehicle parking instruction alarm system and method for work |
| CN106791075A (en) * | 2016-12-16 | 2017-05-31 | 广东美晨通讯有限公司 | A kind of method and device of prompting |
| CN112113774A (en) * | 2020-06-30 | 2020-12-22 | 上汽通用五菱汽车股份有限公司 | Ramp detection method, detection terminal and storage medium |
| CN112113774B (en) * | 2020-06-30 | 2023-03-14 | 上汽通用五菱汽车股份有限公司 | Ramp detection method, detection terminal and storage medium |
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Open date: 20080723 |