CN107878307A - The device that a kind of pre- anti-vehicle is knocked into the back - Google Patents
The device that a kind of pre- anti-vehicle is knocked into the back Download PDFInfo
- Publication number
- CN107878307A CN107878307A CN201610877899.4A CN201610877899A CN107878307A CN 107878307 A CN107878307 A CN 107878307A CN 201610877899 A CN201610877899 A CN 201610877899A CN 107878307 A CN107878307 A CN 107878307A
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- China
- Prior art keywords
- car
- relevant information
- rear car
- distance
- speed
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
- B60Q1/44—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating braking action or preparation for braking, e.g. by detection of the foot approaching the brake pedal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
- B60W30/08—Active safety systems predicting or avoiding probable or impending collision or attempting to minimise its consequences
- B60W30/095—Predicting travel path or likelihood of collision
- B60W30/0953—Predicting travel path or likelihood of collision the prediction being responsive to vehicle dynamic parameters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
- B60W40/10—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to vehicle motion
- B60W40/105—Speed
Abstract
The embodiment of the present invention provides the device that a kind of pre- anti-vehicle is knocked into the back, and described device includes：Rear car monitoring modular, processor and brake lamp；The speed relevant information and rear car and the distance of this car of the rear car monitoring modular detection rear car, and the distance of the speed relevant information and rear car that detect and this car is sent to processor；The processor receives the speed relevant information and rear car and the distance of this car of the rear car monitoring modular detection, and calculates the probability that rear car and this car knock into the back according to the speed relevant information and rear car and the distance of this car；It is determined that whether the probability that knocks into the back calculated exceedes predetermined probabilities, if the probability that knocks into the back calculated exceedes the predetermined probabilities, sent to brake lamp and light signal；The signal of the brake lamp reception processing device, is lighted.The device that the pre- anti-vehicle of the embodiment of the present invention is knocked into the back, this car can be effectively avoided to be knocked into the back.
Description
Technical field
The present invention relates to technical field of vehicle safety, the device to be knocked into the back more particularly, to a kind of pre- anti-vehicle.
Background technology
In running at high speed, it is to be related to the first big important affair of traffic safety to keep safe distance between vehicles.Due on numerous new car new hands
Road, they often ignore this point, without keeping safe distance between vehicles to be easy to cause car rear-end front truck in front truck emergency brake
Accident.According to incompletely statistics, the 29% of car accident is all as caused by car rear-end event.
Inventor has found that at present, major automobile generation factory and parts factory are all positive during the present invention is realized
The various automobile active safeties of exploitation and passive safety system of active.However, most of active safety systems are both for this car
It not bump against people, car or other objects of front of the host and design, whether few security systems pay close attention to this car by car rear-end.
And in actual driving procedure, particularly during highway driving, if do not paid attention to maintaining safe distance with rear car, still it is easy to
This car occurs by the accident of car rear-end.It can be seen that existing rear-end collision preventing system, can not effectively prevent this car and be chased after by rear car
Tail.
The content of the invention
The invention provides the device that a kind of pre- anti-vehicle is knocked into the back, and can not have to solve existing rear-end collision preventing system
Effect prevents the problem of this car is by car rear-end.
In order to solve the above problems, the invention discloses the device that a kind of pre- anti-vehicle is knocked into the back, described device includes：Afterwards
Car monitoring modular, processor and brake lamp；The speed relevant information and rear car and sheet of the rear car monitoring modular detection rear car
The distance of car, and the distance of the speed relevant information and rear car that detect and this car is sent to processor；The processor connects
The speed relevant information and rear car and the distance of this car of the rear car monitoring modular detection are received, and it is related according to the speed
The distance of information and rear car and this car calculates the probability that rear car and this car knock into the back；It is determined that calculate knock into the back probability whether
More than predetermined probabilities, if the probability that knocks into the back calculated exceedes the predetermined probabilities, sent to brake lamp and light signal；
The signal of the brake lamp reception processing device, is lighted.
Compared with prior art, the present invention has advantages below：
The device that a kind of pre- anti-vehicle provided in an embodiment of the present invention is knocked into the back, rear car can be detected by rear car monitoring modular
Speed relevant information and rear car and the range information from car, and by the rear car speed relevant information and rear car that detect and certainly
The range information of car is sent to processor, and processor receives above- mentioned information and calculates rear car according to above- mentioned information and chased after with this car
The probability of tail, and this car whether there is collision risk according to this probabilistic determination.So as to exceed peace in speed and distance in rear car
During gamut, prompting in time is slowed down and brake, prevents the generation of rear-end collision, so as to which effectively prevention vehicle is chased after by rear car
Tail.
Described above is only the general introduction of technical solution of the present invention, in order to better understand the technological means of the present invention,
And can be practiced according to the content of specification, and in order to allow above and other objects of the present invention, feature and advantage can
Become apparent, below especially exemplified by the embodiment of the present invention.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are this hairs
Some bright embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can be with root
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structural representation for the device that a kind of pre- anti-vehicle of the embodiment of the present invention one is knocked into the back；
Fig. 2 is the structural representation for the device that a kind of pre- anti-vehicle of the embodiment of the present invention two is knocked into the back.
Embodiment
The exemplary embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although the disclosure is shown in accompanying drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
Limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
Completely it is communicated to those skilled in the art.
Embodiment one
Reference picture 1, show the structural representation for the device that a kind of pre- anti-vehicle of the present invention is knocked into the back.The present invention is implemented
The device that the prevention rear vehicle of example is knocked into the back includes：Rear car monitoring modular 101, processor 102 and brake lamp 103.
Specifically, rear car monitoring modular 101 detects the speed relevant information and rear car and the distance of this car of rear car, and will visit
The speed relevant information and rear car measured and the distance of this car are sent to processor.
Processor 102 receives the speed relevant information and rear car and the distance of this car of the detection of rear car monitoring modular 101, and root
The probability that rear car and this car knock into the back is calculated according to speed relevant information and rear car and the distance of this car；It is determined that what is calculated chases after
Whether tail probabilities exceed predetermined probabilities, if the probability that knocks into the back calculated exceedes predetermined probabilities, are sent to brake lamp 103 and light letter
Number.
It should be noted that during specific implementation, can be by speed relevant information and apart from relevant information, meter
Other and the speed and the information of distance dependent such as acceleration are calculated, then probability is calculated by above- mentioned information, due to different type car
Safe distance be not quite similar, such as large truck is different from the safe distance of pony car, different brands and difference
Its braking time of the vehicle of type is also what is be not quite similar, such as benz truck is different from the braking time of TOYOTA car, therefore
When car rear-end probability occurs for car and this car after computation, it is necessary to consider vehicle, vehicle brand, rear vehicle speed, rear car with
The multiple factors such as the distance of this car, specific calculation can be configured according to the actual requirements by those skilled in the art,
This is not especially limited in the embodiment of the present invention.It should be noted that during specific implementation, the numerical value of predetermined probabilities can
To be configured according to the actual requirements by those skilled in the art, this is not especially limited in the embodiment of the present invention.
The signal of the reception processing device of brake lamp 103, is lighted.
When lighting brake lamp, prompt rear car driver to slow down and kept at a distance with this car.
Wherein, the device that the pre- anti-vehicle in the embodiment of the present invention is knocked into the back is arranged on vehicle, is mentioned in the above
" this car " vehicle of the device that pre- anti-vehicle is knocked into the back is installed, station is carried out in the angle of " this car " in the embodiment of the present invention
Explanation.
The device that pre- anti-vehicle is knocked into the back is powered by the 12V power supplys of vehicle itself, and processor is installed on vehicle body, passes through spiral shell
Bolt is fixedly connected with vehicle body, and rear car monitoring modular is arranged on vehicle tail, is fixed with vehicle back buffer beam by support and bolt
Connection.Wherein, rear car monitoring modular can be to contain radar or laser radar, range sensor, velocity sensor, acceleration
One or more of sensor.
Preferably, radar is selected as rear car monitoring modular, is the advantages of radar：No matter day and night can work
Make, and there is a transparent shield for carrying heater strip on radar surface, protective cover plays sleety weather heating, prevents sleet mist to thunder
Up to the influence of sensor.And prevent slungshot on road etc. from producing shock to radar surface and damaging.
The device that pre- anti-vehicle provided in an embodiment of the present invention is knocked into the back, rear car speed phase is detected by rear car monitoring modular
Close information and rear car and the range information from car, and by the rear car speed relevant information and rear car that detect with from car away from
Send to processor, processor reception above- mentioned information and knocked into the back according to above- mentioned information calculating rear car with this car general from information
Rate, and this car whether there is collision risk according to this probabilistic determination.So as to exceed safe range in speed and distance in rear car
When, prompting in time is slowed down and brake, prevents the generation of rear-end collision, is that this car is chased after by rear car so as to effectively prevent vehicle
Tail.
Embodiment two
Reference picture 2, show the structural representation for the device that a kind of pre- anti-vehicle of the present invention is knocked into the back.
The device that prevention rear vehicle shown in the embodiment of the present invention knocks into the back includes：Rear car monitoring modular 201, processor 202
And brake lamp 203.
Rear car monitoring modular 201 detects the speed relevant information of rear car and the distance of rear car and this car, and will detect
Speed relevant information and rear car and the distance of this car are sent to processor 202；Processor 202 receives the rear car monitoring modular
The speed relevant information and rear car and the distance of this car of 201 detections, and according to speed relevant information and rear car and the distance of this car
To calculate the probability that rear car and this car knock into the back；It is determined that whether the probability that knocks into the back calculated exceedes predetermined probabilities, if calculating
The probability that knocks into the back exceed the predetermined probabilities, then sent to brake lamp 203 and light signal；The letter of the reception processing device of brake lamp 203
Number, lighted.
Wherein, the variable during probability calculation that knocks into the back includes：This car speed, this car deceleration, rear vehicle speed, rear car and
This car distance, rear car deceleration, safe stopping distance etc..Because automobile brake distance is different under different speeds, therefore to rear car
Prompting should be according to speed difference tip distance also different mode.
When calculating, the distance between front truck and rear car are regarded as a variable, the excursion of speed is by spacing
Control, the excursion that spacing is pushed the speed also and then increase, spacing reduce speed excursion and then reduce.
It should be noted that when the probability that knocks into the back calculated exceedes the predetermined probabilities, processor is removed and sent out to brake lamp 203
Go out to light outside signal, control signal can also be sent to automobile tail light, steering indicating light, hazard way light, wherein, control signal can be with
Can also be flash signal to light signal.After automobile tail light receives control signal, automobile tail light, flicker automobile can be lighted
Taillight；Brake lamp can flash automobile brake lamp after receiving control signal；Steering indicating light can flash after receiving control signal
Left and right turn signal；After hazard way light receives control signal, hazard way light can be flashed.
Preferably, rear car monitoring modular 201, the first speed phase of more than one rear car specifically for detecting rear view of vehicle
Information and one above rear car are closed respectively with first between this car apart from relevant information, and the first car that will be detected
Fast relevant information and first sent apart from relevant information to processor；Processor 202 includes：Receiving unit 2021, for connecing
Receive the first speed relevant information and second distance relevant information that the rear car monitoring modular is sent；Probability calculation unit
2022, for, apart from relevant information, calculating more than one rear car according to the first speed relevant information and first and occurring with this car
The probability to knock into the back, obtain more than one car rear-end probability；Judging unit 2023, for according to more than one car rear-end probability
With judging whether collision risk, if in the presence of collision risk, sent to brake lamp and light signal.
Rear car detection module 201 simultaneously the speed relevant information to more than one rear car at this car rear and one with
Between upper rear car and this car first apart from relevant information, and for each rear car calculate its send with this car knock into the back it is general
Rate, so, when the probability that knocked into the back corresponding to wherein any one rear car exceeds the i.e. probability threshold value of predetermined probabilities, it is determined that exist
Collision risk, more comprehensive this car can be protected, avoided by car rear-end.
Preferably, rear car monitoring modular 201 includes：Detectable signal transmitting element 2011, for after more than one
Car sends the first detectable signal；Detectable signal receiving unit 2012, for receiving returned by one above rear car second
Detectable signal；Processing unit 2013, calculated for second detection information by receiving and obtain the first speed phase
Information and described first is closed apart from relevant information.
Preferably, the device that the pre- anti-vehicle of the embodiment of the present invention is knocked into the back also includes：Safety belt, warning light, loudspeaker；Afterwards
Car monitoring modular 201 is additionally operable to：Brake lamp light and then it is secondary obtain rear view of vehicle more than one rear car the second speed
Second distance relevant information between relevant information and more than one rear car and this car, and the second speed got is related
Information and second distance relevant information are sent to processor 202；Processor 202 is additionally operable to：Rear car monitoring modular is received to send
The second speed relevant information and second distance relevant information, it is and related according to the second speed relevant information and second distance
Information, judges whether more than one rear car takes brake measure；If more than one rear car does not take brake measure, to safety belt
And/or warning light and/or loudspeaker send control signal.In addition, processor can also when it is determined that rear car does not take brake measure,
Control signal is sent to this car vehicle window.
This preferred embodiment, when lighting brake lamp, prompt after rear car driver slows down, if rear car speed do not take it is any
Brake measure, then need to take other precautionary measures to remind rear car, therefore need to continue to obtain the spacing and speed of rear car, and determine
Whether rear car takes brake measure, if judging, rear car does not take brake measure, tightens up safety belt, so as to lift car vehicle occupant
The security of member.At the same time it can also send prompting light and prompt tone, prompt driver to pay attention to rear car state, further avoid
This car is knocked into the back, and improves the degree of safety of vehicle.
Preferably, safety belt is used to upon the reception of control signals, tighten up according to the control signal.
Preferably, vehicle window is used to upon the reception of control signals, close according to the control signal.
Preferably, the warning light is used to upon the reception of control signals, prompting light is sent according to the control signal；Its
In, the prompting light is used to prompt driver to pay attention to the rear car state.
Preferably, after loudspeaker receive control signal, sound is sent according to control signal；Wherein, the sound sent is used
Maintained safe distance in prompting driver's front truck driver with rear car.
Preferably, judging unit 2023 is specifically used for：More than one car rear-end probability and predetermined probabilities are carried out respectively
Compare, if any of which car rear-end probability is more than predetermined probabilities, judged result is in the presence of collision risk.
Preferably, the rear car monitoring modular of vehicle tail installation can be the Distance-sensing containing radar or laser radar
One or more of device or velocity sensor.
The device that a kind of pre- anti-vehicle provided in an embodiment of the present invention is knocked into the back, after with the prevention in embodiment one
Possessed by vehicle rear-end collision device outside beneficial effect, detection rear car is continued by rear car monitoring modular also after brake lamp is lighted
Speed and range information and be sent to processor, if now rear car does not take brake measure, this car can send control letter
Number to peripheral hardwares such as safety belt, warning light or loudspeaker, it now can tighten up safety belt and send prompt tone in the car or carry
Show that light prompting driver pays attention to rear car state, further improve the degree of safety of vehicle.
Each embodiment in this specification is described by the way of progressive, what each embodiment stressed be with
The difference of other embodiment, between each embodiment identical similar part mutually referring to.For system embodiment
For, because it is substantially similar to embodiment of the method, so description is fairly simple, referring to the portion of embodiment of the method in place of correlation
Defend oneself bright.
The device to be knocked into the back above to a kind of pre- anti-vehicle provided by the present invention, is described in detail, and herein should
The implementation steps and realization device of the present invention are set forth with specific case, the explanation of above example is only intended to help
Assistant solves the method and its core concept of the present invention；Meanwhile for those of ordinary skill in the art, the think of according to the present invention
Think, in specific embodiments and applications there will be changes, in summary, this specification content should not be construed as pair
The limitation of the present invention.It should be noted that the present invention will be described rather than limits the invention for above-described embodiment, and
And those skilled in the art can design alternative embodiment without departing from the scope of the appended claims.Will in right
In asking, any reference symbol between bracket should not be configured to limitations on claims.Word "comprising" is not excluded for
Element or step not listed in the claims be present.Word "a" or "an" before element does not exclude the presence of multiple
Such element.The present invention can be by means of including the hardware of some different elements and by means of properly programmed computer
To realize.In if the unit claim of equipment for drying is listed, several in these devices can be by same hard
Part item embodies.The use of the grade of word first, second does not indicate that any order.These words can be construed to title.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic；
And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and
Scope.
Claims (8)
1. the device that a kind of pre- anti-vehicle is knocked into the back, it is characterised in that described device includes：Rear car monitoring modular, processor with
And brake lamp；
The speed relevant information and rear car and the distance of this car of the rear car monitoring modular detection rear car, and the speed that will be detected
Relevant information and rear car and the distance of this car are sent to processor；
The processor receives the speed relevant information and rear car and the distance of this car of the rear car monitoring modular detection, and
The probability that rear car and this car knock into the back is calculated according to the speed relevant information and rear car and the distance of this car；It is determined that calculate
Whether the probability that knocks into the back gone out exceedes predetermined probabilities, if the probability that knocks into the back calculated exceedes the predetermined probabilities, is sent out to brake lamp
Go out to light signal；
The signal of the brake lamp reception processing device, is lighted.
2. device according to claim 1, it is characterised in that：
The rear car monitoring modular, specifically for detect rear view of vehicle more than one rear car the first speed relevant information and
One above rear car is respectively with first between this car apart from relevant information, and the first speed relevant information that will be detected
And first send to processor apart from relevant information；
The processor includes：
Receiving unit, for receiving the first speed relevant information and the related letter of second distance that the rear car monitoring modular is sent
Breath；
Probability calculation unit, for, apart from relevant information, calculating institute according to the first speed relevant information and described first
The probability that more than one rear car knocks into the back with described car is stated, obtains more than one car rear-end probability；
Judging unit, for judging whether collision risk with described according to one above car rear-end probability, if depositing
In collision risk, then sent to brake lamp and light signal.
3. device according to claim 2, it is characterised in that the rear car monitoring modular includes：
Detectable signal transmitting element, for sending the first detectable signal to one above rear car；
Detectable signal receiving unit, for receiving the second detectable signal returned by one above rear car；
Processing unit, for calculated by second detection information that receives obtain the first speed relevant information and
Described first apart from relevant information.
4. device according to claim 2, it is characterised in that described device also includes：Safety belt, warning light, loudspeaker；
The rear car monitoring modular is additionally operable to：The brake lamp light and then it is secondary obtain rear view of vehicle more than one after
Second distance relevant information between the second speed relevant information and one above rear car and described car of car, and will
The the second speed relevant information and the second distance relevant information got is sent to the processor；
The processor is additionally operable to：Receive the second speed relevant information that the rear car monitoring modular sends and described the
Two apart from relevant information, and according to the second speed relevant information and the second distance relevant information, judges described one
Whether individual above rear car takes brake measure；If one above rear car does not take brake measure, to safety belt and/or carry
Show that lamp and/or loudspeaker send control signal.
5. device according to claim 4, it is characterised in that：
The safety belt is used to upon the reception of control signals, tighten up according to the control signal.
6. device according to claim 4, it is characterised in that：
The warning light is used to upon the reception of control signals, prompting light is sent according to the control signal；
Wherein, the prompting light is used to prompt driver to pay attention to the rear car state.
7. device according to claim 4, it is characterised in that：
After the loudspeaker receive control signal, sound is sent according to the control signal；
Wherein, the sound is used to prompt rear car driver to pay attention to maintaining safe distance with front truck.
8. device according to claim 2, it is characterised in that the judging unit is specifically used for：
Respectively by one above car rear-end probability compared with predetermined probabilities, if any of which car rear-end probability
More than the predetermined probabilities, then judged result is in the presence of collision risk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610877899.4A CN107878307A (en) | 2016-09-30 | 2016-09-30 | The device that a kind of pre- anti-vehicle is knocked into the back |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610877899.4A CN107878307A (en) | 2016-09-30 | 2016-09-30 | The device that a kind of pre- anti-vehicle is knocked into the back |
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|---|---|
| CN107878307A true CN107878307A (en) | 2018-04-06 |
Family
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610877899.4A Withdrawn CN107878307A (en) | 2016-09-30 | 2016-09-30 | The device that a kind of pre- anti-vehicle is knocked into the back |
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| CN110395176A (en) * | 2019-08-05 | 2019-11-01 | 浙江一网通信息科技有限公司 | Automobile rear molding anticollision prompt system and its method |
| CN110816521A (en) * | 2019-10-20 | 2020-02-21 | 陈丙涛 | Driving parameter big data analysis system |
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