CN105253126A - Automatic braking system based on FPGA - Google Patents
Automatic braking system based on FPGA Download PDFInfo
- Publication number
- CN105253126A CN105253126A CN201510567080.3A CN201510567080A CN105253126A CN 105253126 A CN105253126 A CN 105253126A CN 201510567080 A CN201510567080 A CN 201510567080A CN 105253126 A CN105253126 A CN 105253126A
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- China
- Prior art keywords
- fpga
- system based
- module
- data analysis
- processing module
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T7/00—Brake-action initiating means
- B60T7/12—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger
- B60T7/22—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger initiated by contact of vehicle, e.g. bumper, with an external object, e.g. another vehicle, or by means of contactless obstacle detectors mounted on the vehicle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T2201/00—Particular use of vehicle brake systems; Special systems using also the brakes; Special software modules within the brake system controller
- B60T2201/02—Active or adaptive cruise control system; Distance control
- B60T2201/022—Collision avoidance systems
Abstract
The invention relates to an automatic braking system based on a FPGA; the automatic braking system based on the FPGA comprises a measuring module, a data analysis and processing module, and an automatic braking module; the measuring module measures the information, and sends the information to the data analysis and processing module; the data analysis and processing module processes the received information so as to obtain a result, and sends the result to the automatic braking module; the automatic braking module analyzes the result, and gives an order. The automatic braking system based on the FPGA can successfully realize the automatic braking function under emergency, is simple in design, and high in instantaneity and stability, thus effectively ensuring life safety of vehicle drivers.
Description
Technical field
The present invention relates to a kind of brake system, be specifically related to a kind of autobrake system based on FPGA.
Background technology
Along with socioeconomic development, car owners become day by day huge, but meanwhile, the generation of traffic accident also becomes more frequent, therefore many chaufeurs lose valuable life, and according to the recent statistics of traffic department, most of accident be cannot brake in time due to car owner, result causes vehicle collides therewith.In order to reduce the personal casualty and property damage that traffic accident causes, automobile automatic brake system must occur it being also naturally.
Summary of the invention
The invention provides a kind of autobrake system based on FPGA, this system adopts FPGA as master control unit, and by the Computer Aided Design of super sonic and Hall element, realizes the automobile automatic brake function in emergency circumstances with high real-time and stability.
To achieve these goals, the present invention adopts following technical scheme: a kind of autobrake system based on FPGA, comprises measurement module, data analysis and processing module and self-actuating brake module; After described measurement module measurement obtains information, by information transmission to data analysis and processing module, described data analysis and processing module are carried out process to the information received and are obtained result, and result is transferred to self-actuating brake module, described self-actuating brake module is analyzed result and then is sent instruction.
Preferably, described measurement module comprises ultrasonic transduter and Hall element, and described ultrasonic transduter road is for detecting front-and-rear vehicle distance, and described Hall element is for detecting this car speed of a motor vehicle.Described ultrasonic transduter arranges two altogether, is arranged on front side and car rear respectively, the detection before being respectively used to car and after car; Described Hall element is arranged on chassis.
Preferably, described data analysis and processing module adopt FPGA process chip.Described FPGA process chip adopts the model of Taiwan You Jing company to be the chip of CycloneIVEP4CE115F29.
Preferably, described self-actuating brake module comprises brake control unit and audio alert unit.Described phonetic alarm adopts 2500 sequence of speech chips of American I SD company.
Autobrake system based on FPGA of the present invention, different with traditional scheme, this system adopts FPGA as master control system, and by the Computer Aided Design of super sonic and Hall element, successfully can not only realize automatic brake functions in emergency circumstances, but also there is simplicity of design, real-time and the higher feature of stability, therefore, it is possible to the life security of actv. support vehicles chaufeur.
Accompanying drawing explanation
Fig. 1 is the module composition schematic diagram of system;
Fig. 2 is system hardware composition diagram;
Fig. 3 is voice alarm circuit;
Fig. 4 is system initialization schematic diagram;
Fig. 5 is self-actuating brake diagram of circuit.
Detailed description of the invention
Below in conjunction with embodiment, content of the present invention is further described.
As shown in Figure 1, a kind of autobrake system based on FPGA, comprises measurement module, data analysis and processing module and self-actuating brake module; After described measurement module measurement obtains information, by information transmission to data analysis and processing module, described data analysis and processing module are carried out process to the information received and are obtained result, and result is transferred to self-actuating brake module, described self-actuating brake module is analyzed result and then is sent instruction.
As shown in Figure 2, described measurement module comprises ultrasonic transduter and Hall element, and described ultrasonic transduter road is for detecting front-and-rear vehicle distance, and described Hall element is for detecting this car speed of a motor vehicle.Described ultrasonic transduter arranges two altogether, is arranged on front side and car rear respectively, the detection before being respectively used to car and after car; Described Hall element is arranged on chassis.
Described data analysis and processing module adopt FPGA process chip.Described FPGA process chip adopts the model of Taiwan You Jing company to be the chip of CycloneIVEP4CE115F29.
Described self-actuating brake module comprises brake control unit and audio alert unit.Described phonetic alarm adopts 2500 sequence of speech chips of American I SD company.
Described measurement module, primarily of ultrasonic transduter and Hall element composition, is used for the current speed of a motor vehicle of Real-time Obtaining vehicle and the distance between Ben Che, front truck or obstacle.
The function of described Data Analysis Services module realizes primarily of FPGA, carries out discriminator, analytical calculation and comprehensive treatment to parameters such as the speed recorded and distances, and these data will be realize self-stopping important references.
Described self-actuating brake module comprises audio alert unit and brake control unit, modeling is carried out to the data analyzed above, moving velocity and the state of automobile is judged according to model, current travel conditions is analyzed, and then judge whether vehicle exceeds the speed limit and whether exceed safety distance etc., then feed back to chaufeur and carry out reference, have the operation such as audio alert prompting and the rear self-actuating brake of time-out if desired.
The signal that certain is not easily carried out data analysis by sensor is converted into the electric signal of analyzing and processing.Being provided with two ultrasonic transduters in native system carries out before car and detection after car, and Hall element is arranged on chassis and detects the speed of a motor vehicle.
Microprocessor is the core of Data Analysis Services in native system, and radical function carries out analyzing and processing to the signal of automotive check, obtains the data such as spacing and the speed of a motor vehicle, and carries out modeling to it and judge vehicle condition state.Native system adopts FPGA process chip to carry out data processing, make full use of the feature of its good alerting ability, repeatability and real-time, complete the correlation function of data processing module and self-actuating brake module, the running velocity of system, execution efficiency, parallel processing capability and reliability are guaranteed.
The voice alarm circuit of the audio alert unit of native system as shown in Figure 3.Alerting signal alerting drivers can be produced when the travel conditions of automobile reaches the standard of setting, use 2500 of American I SD company serial professional speech chips in circuit, ISD2500 is DIP encapsulation, and in sheet, EPROM can reach the capacity of 480kb, ten A wires, energy addressing 1024, record length is long, supports subsection record, tonequality is good, support anti-power-off feature, inside is integrated with power amplifier, can Direct driver loud speaker.
The software flow pattern of autobrake system as shown in Figure 4.Software flow monitors realization by two aspects simultaneously, on the one hand, whether judging distance reaches alarm distance, if reach alarm distance then then to judge whether to be less than safety distance, if do not arrive safety distance then alarm chaufeur, etc. deceleration to be operated, if chaufeur does not make any operation, after distance is less than safety distance by the time, system understands self-actuating brake; On the other hand, judge whether the relative velocity of automobile distance is greater than alarm velocity, if be greater than alarm velocity can continue to judge whether to be greater than safety speed, if not, first alarm latency driver's operation, if when speed of a motor vehicle continuation increase is even greater than safety speed, can brake by force to ensure driver safety.
Need to carry out system initialization before native system application, system initialization calculates correlated results to the data analysis of automobile, as shown in Figure 5.This vehicle speed, front vehicle speed and spacing can be detected after initialization, and Real-Time Monitoring, the speed of a motor vehicle according to both can calculate relative velocity, carry out modeling analysis according to parameters such as spacings again and obtain alarm distance d1, safe distance between vehicles d2, alarm velocity v1, safe speed v2, detection real-time each time all can upgrade d1, d2, v1, v2, realizes the initialization of system.
Utilize hypracoustic boomer performance, after receiving electric signal, FPGA process chip can calculate the relative distance H=1/2 × vtcos θ between front truck and this car.In formula, v is the aerial propagation speed of super sonic (under normal temperature, v is a certain constant); T is that super sonic receives the time used from being transmitted into.Because angle θ is almost 0, so above formula can be changed into:
H＝1/2×vt。
Utilizing Hall element to carry out in the process of vehicle speed measurement, also need to use irony gear.When vehicle wheel rotation, measure speed gears also can rotate thereupon, and then causing the magnetic flux density between gear and Hall element to change, sensor is once detect that this change will export an impulse singla at once, and the speed of automobile just can be drawn by the frequency of ranging pulse.Concrete computing formula is: V=C × n, and wherein, V is car speed, and C is gear girth, and n is automobile rotational speed.
The safety distance of supposing the system identification is d1, that is to say under current vehicle speed, guarantee safety time Ben Che and leading vehicle distance are not less than d1; Because the safety distance value under friction speed is different, so the numerical value of d1 is in constantly change.According to several processes of automobile brake, consider following time parameter, comprise reaction t opening time
f, brake coordination time t
x, deceleration/decel build up time and perseveration time t
z, so safe distance between vehicles computation model such as formula:
In formula, the speed of brake moment vehicle during V0.Do not consider other factors, the computation model of safe distance between vehicles such as formula:
In formula, V
afor the speed of a motor vehicle of front truck.
Claims (7)
1. based on an autobrake system of FPGA, it is characterized in that: comprise measurement module, data analysis and processing module and self-actuating brake module; After described measurement module measurement obtains information, by information transmission to data analysis and processing module, described data analysis and processing module are carried out process to the information received and are obtained result, and result is transferred to self-actuating brake module, described self-actuating brake module is analyzed result and then is sent instruction.
2. the autobrake system based on FPGA according to claim 1, it is characterized in that: described measurement module comprises ultrasonic transduter and Hall element, described ultrasonic transduter road is for detecting front-and-rear vehicle distance, and described Hall element is for detecting this car speed of a motor vehicle.
3. the autobrake system based on FPGA according to claim 2, is characterized in that: described ultrasonic transduter arranges two altogether, is arranged on front side and car rear respectively, the detection before being respectively used to car and after car; Described Hall element is arranged on chassis.
4. the autobrake system based on FPGA according to claim 1, is characterized in that: described data analysis and processing module adopt FPGA process chip.
5. the autobrake system based on FPGA according to claim 4, is characterized in that: described FPGA process chip adopts the model of Taiwan You Jing company to be the chip of CycloneIVEP4CE115F29.
6. the autobrake system based on FPGA according to claim 1, is characterized in that: described self-actuating brake module comprises brake control unit and audio alert unit.
7. according to the autobrake system based on FPGA that claim 6 is stated, it is characterized in that: described phonetic alarm adopts 2500 sequence of speech chips of American I SD company.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510567080.3A CN105253126A (en) | 2015-09-08 | 2015-09-08 | Automatic braking system based on FPGA |
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| CN201510567080.3A CN105253126A (en) | 2015-09-08 | 2015-09-08 | Automatic braking system based on FPGA |
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| CN105253126A true CN105253126A (en) | 2016-01-20 |
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| CN201510567080.3A Pending CN105253126A (en) | 2015-09-08 | 2015-09-08 | Automatic braking system based on FPGA |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020086786A (en) * | 2001-05-11 | 2002-11-20 | 엘지이노텍 주식회사 | Radar system for preventing impact of vehicle |
| CN101339246A (en) * | 2008-08-08 | 2009-01-07 | 太原理工大学 | Chaos signal radar automobile anti-collision system and its method |
| CN202217053U (en) * | 2011-06-30 | 2012-05-09 | 桂林电子科技大学 | Linear frequency modulated continuous wave automobile anti-collision radar system |
| CN103072537A (en) * | 2013-02-05 | 2013-05-01 | 湖南大学 | Automotive collision avoidance safety protecting device and protecting method based on infrared image processing |
| CN203259653U (en) * | 2013-05-15 | 2013-10-30 | 桂林电子科技大学 | Multi-target detection system of automotive anti-collision radar |
-
2015
- 2015-09-08 CN CN201510567080.3A patent/CN105253126A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020086786A (en) * | 2001-05-11 | 2002-11-20 | 엘지이노텍 주식회사 | Radar system for preventing impact of vehicle |
| CN101339246A (en) * | 2008-08-08 | 2009-01-07 | 太原理工大学 | Chaos signal radar automobile anti-collision system and its method |
| CN202217053U (en) * | 2011-06-30 | 2012-05-09 | 桂林电子科技大学 | Linear frequency modulated continuous wave automobile anti-collision radar system |
| CN103072537A (en) * | 2013-02-05 | 2013-05-01 | 湖南大学 | Automotive collision avoidance safety protecting device and protecting method based on infrared image processing |
| CN203259653U (en) * | 2013-05-15 | 2013-10-30 | 桂林电子科技大学 | Multi-target detection system of automotive anti-collision radar |
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Application publication date: 20160120 |
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