CN109291922A - A kind of automatic identification small obstacle and the driving assistance system braked and control method - Google Patents

A kind of automatic identification small obstacle and the driving assistance system braked and control method Download PDF

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Publication number
CN109291922A
CN109291922A CN201811155021.5A CN201811155021A CN109291922A CN 109291922 A CN109291922 A CN 109291922A CN 201811155021 A CN201811155021 A CN 201811155021A CN 109291922 A CN109291922 A CN 109291922A
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barrier
test pattern
vehicle
size
ground
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CN201811155021.5A
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CN109291922B (en
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曹祥元
苟斌
舒本亮
贾晓龙
占传送
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Dongfeng Motor Corp
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Dongfeng Motor Corp
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT 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
    • B60W30/00Purposes 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
    • B60W30/08Active safety systems predicting or avoiding probable or impending collision or attempting to minimise its consequences
    • B60W30/095Predicting travel path or likelihood of collision
    • B60W30/0956Predicting travel path or likelihood of collision the prediction being responsive to traffic or environmental parameters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT 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
    • B60W10/00Conjoint control of vehicle sub-units of different type or different function
    • B60W10/18Conjoint control of vehicle sub-units of different type or different function including control of braking systems
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT 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
    • B60W10/00Conjoint control of vehicle sub-units of different type or different function
    • B60W10/20Conjoint control of vehicle sub-units of different type or different function including control of steering systems
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT 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
    • B60W30/00Purposes 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
    • B60W30/08Active safety systems predicting or avoiding probable or impending collision or attempting to minimise its consequences
    • B60W30/09Taking automatic action to avoid collision, e.g. braking and steering
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT 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
    • B60W40/00Estimation 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
    • B60W40/02Estimation 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 ambient conditions
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT 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
    • B60W2554/00Input parameters relating to objects
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT 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
    • B60W2710/00Output or target parameters relating to a particular sub-units
    • B60W2710/18Braking system
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT 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
    • B60W2710/00Output or target parameters relating to a particular sub-units
    • B60W2710/20Steering systems

Abstract

The invention discloses a kind of automatic identification small obstacle and the driving assistance system braked and control methods.It includes projecting unit, for projecting test pattern to vehicle front ground;Receiving unit, height of the receiving unit apart from ground are higher than height of the projecting unit apart from ground, the reflective graphics generated on vehicle front ground or barrier for receiving test pattern;Control unit, for judging whether vehicle front has barrier according to test pattern and reflective graphics, the size of barrier and the position of barrier relative vehicle are determined when there is barrier, and are determined whether to control vehicle deceleration braking or turning avoidance according to the size of barrier.Driving assistance system of the present invention utilizes the deformation of test pattern on opposed flattened road surface on the road surface for having small obstacle, come position and obstacle height or the depth of disturbance in judgement object relative vehicle, and then vehicle deceleration braking or turning avoidance are controlled, effectively increase drive safety and comfort.

Description

A kind of automatic identification small obstacle and the driving assistance system braked and control method
Technical field
The invention belongs to automobile technical fields, and in particular to a kind of automatic identification small obstacle and the driving braked auxiliary System and control method.
Background technique
Current vehicle low speed collision avoidance system although may be implemented automatic retarding but be only capable of identification traffic etc. compared with Big object, can not identifying height, it is even more impossible to identify that road is cheated in the barrier of 10cm or so.Some national highway provincial highways or other On the paved road of some non-close, it will usually have some broken holes perhaps the barriers such as stone speed is very fast or illumination item In the case that part is poor, driver is difficult to identify and slow down in advance in time, not only can be right when passing through these small obstacles at a high speed Passenger causes severe turbulence that can also cause certain damage to vehicle.
Summary of the invention
The object of the invention is to provide a kind of small-sized barrier of automatic identification to solve deficiency existing for above-mentioned background technique The driving assistance system and control method for hindering object and braking.
The technical solution adopted by the present invention is that: a kind of automatic identification small obstacle and the driving assistance system braked, packet It includes
Projecting unit is installed on front of the car, for projecting test pattern to vehicle front ground;
Receiving unit, is installed on front of the car, and height of the receiving unit apart from ground is higher than projecting unit apart from ground Highly, the reflective graphics generated on vehicle front ground or barrier for receiving test pattern, are sent to control unit;
Control unit, for judging whether vehicle front has barrier according to test pattern and reflective graphics, when there is obstacle The size of barrier and the position of barrier relative vehicle are determined when object, and are determined whether to control vehicle according to the size of barrier Retarding braking or turning avoidance.
Further, the method for judging vehicle front and whether having barrier are as follows: by reflective graphics and test pattern into Row compares, when a certain region occurred in reflective graphics is equivalent to the feelings that corresponding the same area is deformed in test pattern Condition, it is determined that vehicle front has barrier.
Further, the method for the position of the determining barrier relative vehicle are as follows:, will using test pattern center as origin Test pattern, reflective graphics and front of the car profile are placed in the same coordinate system, in the region being deformed on reflective graphics away from Farthest from origin is a little barrier position, and definition barrier position is the first coordinate, is defined in front of the car Heart position is the second coordinate, according to the position of the first coordinate and the second coordinate in a coordinate system, is determined by geometrical principle The position of barrier relative vehicle.
Further, it is determined that the method for the size of barrier are as follows: be calculated by the following formula multiple part positions on barrier Size c is set, the order of magnitude of more multiple local location sizes is maximized the size as barrier,
C=a* [tan (γ-α)/tan (γ-β) -1]/[1-a*tan (γ-α)/b*tan (γ-β)],
Wherein a is height of the projecting unit apart from ground, and b is height of the receiving unit apart from ground, and c is barrier part Position dimension, α are that receiving unit optical axis is corresponding with each crosspoint in the reflective graphics on the road surface there are barrier anti- Angle between ray, β are the reflection corresponding with crosspoint each in the reflective graphics on smooth-riding surface of receiving unit optical axis Angle between line, angle of the γ between receiving unit optical axis and vertical direction, δ are each crosspoint pair in test pattern The angle between incident ray and vertical direction answered.
Further, when the size of barrier is more than or equal to setting value, control vehicle deceleration is braked or according to barrier The position control Vehicular turn of relative vehicle avoids, and when the size of barrier is less than setting value, controls normal vehicle operation.
Further, the barrier is object or the road hole for protruding from ground, the size of barrier be object height or Cheat depth in road.
Further, the difference in height of the projecting unit and receiving unit apart from ground is 0.5-1.5m.
Further, the projecting unit and receiving unit are located on same perpendicular.
Further, the test pattern is lattice-like pattern.
Further, the receiving unit is camera.
A kind of automatic identification small obstacle and the driving auxiliary control method braked, process are as follows: to vehicle front ground Test pattern is projected, the reflective graphics that test pattern generates on vehicle front ground or barrier are received, according to test pattern Judge whether vehicle front has barrier with reflective graphics, the size and barrier that barrier is determined when there is barrier are with respect to vehicle Position, and according to the size of barrier determine whether control vehicle deceleration braking or turning avoidance.
Further, the method for judging vehicle front and whether having barrier are as follows: by reflective graphics and test pattern into Row compares, when a certain region occurred in reflective graphics is equivalent to the feelings that corresponding the same area is deformed in test pattern Condition, it is determined that vehicle front has barrier.
Further, the method for the position of the determining barrier relative vehicle are as follows:, will using test pattern center as origin Test pattern, reflective graphics and front of the car profile are placed in the same coordinate system, in the region being deformed on reflective graphics away from Farthest from origin is a little barrier position, and definition barrier position is the first coordinate, is defined in front of the car Heart position is the second coordinate, according to the position of the first coordinate and the second coordinate in a coordinate system, is determined by geometrical principle The position of barrier relative vehicle.
Further, it is determined that the method for the size of barrier are as follows: be calculated by the following formula multiple part positions on barrier Size c is set, the order of magnitude of more multiple local location sizes is maximized the size as barrier,
C=a* [tan (γ-α)/tan (γ-β) -1]/[1-a*tan (γ-α)/b*tan (γ-β)],
Wherein a is height of the projecting unit apart from ground, and b is height of the receiving unit apart from ground, and c is barrier part Position dimension, α are that receiving unit optical axis is corresponding with each crosspoint in the reflective graphics on the road surface there are barrier anti- Angle between ray, β are the reflection corresponding with crosspoint each in the reflective graphics on smooth-riding surface of receiving unit optical axis Angle between line, angle of the γ between receiving unit optical axis and vertical direction, δ are each crosspoint pair in test pattern The angle between incident ray and vertical direction answered.
Further, when the size of barrier is more than or equal to setting value, control vehicle deceleration is braked or according to obstacle The position control Vehicular turn of object relative vehicle avoids, and when the size of barrier is less than setting value, controls normal vehicle operation.
Driving assistance system of the present invention utilizes the change of test pattern on opposed flattened road surface on the road surface for having small obstacle Shape, comes position and obstacle height or the depth of disturbance in judgement object relative vehicle, and then controls vehicle deceleration braking or turn to Evacuation has achieved the purpose that avoiding high speed from breaking the barriers security risk occurs, effectively increases drive safety and comfort.
Detailed description of the invention
Fig. 1 is system principle schematic diagram of the invention.
Fig. 2 is the schematic diagram of test pattern.
Fig. 3 is that barrier size of the present invention determines schematic illustration.
Fig. 4 is the schematic diagram of reflective graphics.
Specific embodiment
The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments, convenient for this hair is well understood It is bright, but they limiting the invention.
As shown in Figure 1, a kind of automatic identification small obstacle of the present invention and the driving assistance system of braking, including
Projecting unit 2 is installed on 1 front end of vehicle, can be laser, for projecting test pattern to vehicle front ground 4, test pattern 4 can be rectangular mesh shape figure, as shown in Fig. 2, being also possible to other figures.
Receiving unit 3 is installed on 1 front end of vehicle, can be camera, and height of the receiving unit 3 apart from ground, which is higher than, throws Height of the unit 2 apart from ground is penetrated, be staggered certain position in height, it can be ensured that transmitting light and reflection light exist centainly Differential seat angle;Receiving unit 3 is sent for receiving the reflective graphics 5 that test pattern 4 generates on vehicle front ground or barrier To control unit;Projecting unit and receiving unit are located on same perpendicular, and projecting unit and receiving unit are apart from ground Difference in height is 0.5-1.5m, and specific height is according to depending on the height of vehicle.
Control unit (not shown) is the body control system in vehicle, for according to test pattern and reflectogram Shape judges whether vehicle front has barrier, and the size and barrier relative vehicle of barrier are determined when judgement has barrier Position, and determined whether to control vehicle deceleration braking or turning avoidance according to the size of barrier, when the size of barrier is greater than When equal to setting value, control vehicle deceleration is braked or is avoided according to the position control Vehicular turn of barrier relative vehicle, works as barrier When the size of object being hindered to be less than setting value, normal vehicle operation is controlled.Barrier can be object or the road hole for protruding from ground, barrier The size for hindering object is that depth is cheated on object height or road.
The present invention also provides a kind of controls of driving assistance system based on above-mentioned automatic identification small obstacle and braking Method, process are as follows: test pattern is projected to vehicle front ground by projecting unit, receiving unit receives test pattern in vehicle The reflective graphics generated on front ground or barrier, control unit judge that vehicle front is according to test pattern and reflective graphics It is no to have barrier, the size of barrier and the position of barrier relative vehicle are determined when there is barrier, and according to barrier Size determines whether to control vehicle deceleration braking or turning avoidance, when the size of barrier is more than or equal to setting value, control vehicle Retarding braking is avoided according to the position control Vehicular turn of barrier relative vehicle, when the size of barrier is less than setting value When, control normal vehicle operation.
In above scheme, due to receiving unit optical axis and there are between the reflected ray on the road surface of barrier angle with It is corresponding in receiving unit shooting there are certain differential seat angle between reflected ray on receiving unit optical axis and smooth-riding surface Certain distance is generated on picture, this will lead to picture relative standard's figure that receiving unit is shot on the road surface for have barrier Modification is generated, modification is bigger to illustrate that road hole or stone are bigger, therefore judges whether vehicle front has the method for barrier Are as follows: reflective graphics are compared with test pattern, when occur a certain region in reflective graphics be equivalent to it is right in test pattern The case where the same area answered is deformed, it is determined that vehicle front has barrier.As shown in figure 4, typically having for one The distorted region of the schematic diagram of the reflective graphics captured on one cylinder road surface Lu Keng, recess is bent to vehicle front.
In above scheme, the method that determines the position of barrier relative vehicle are as follows: using test pattern center as origin, will mark Quasi- figure, reflective graphics and front of the car profile are placed in the same coordinate system, in the region 11 being deformed on reflective graphics away from Farthest from origin is a little barrier position, and definition barrier position is the first coordinate, is defined in front of the car Heart position is the second coordinate, according to the position of the first coordinate and the second coordinate in a coordinate system, is determined by geometrical principle The position of barrier relative vehicle.
In above scheme, as shown in figure 3, the method for determining the size of barrier are as follows: be calculated by the following formula barrier Upper multiple local location size c, the order of magnitude of more multiple local location sizes are maximized the ruler as barrier It is very little,
C=a* [tan (γ-α)/tan (γ-β) -1]/[1-a*tan (γ-α)/b*tan (γ-β)],
Wherein a is height of the projecting unit 2 apart from ground, and b is height of the receiving unit 3 apart from ground, and c is barrier 10 Local location size, α are that receiving unit optical axis 9 is corresponding with each crosspoint in the reflective graphics on the road surface there are barrier Reflected ray 8 between angle, β be receiving unit optical axis 9 it is corresponding with each crosspoint in the reflective graphics on smooth-riding surface Reflected ray 7 between angle, angle of the γ between receiving unit optical axis and vertical direction, δ is each in test pattern Angle between the corresponding incident ray 6 in crosspoint and vertical direction.
The content being not described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.

Claims (13)

1. a kind of automatic identification small obstacle and the driving assistance system braked, it is characterised in that: including
Projecting unit is installed on front of the car, for projecting test pattern to vehicle front ground;
Receiving unit is installed on front of the car, and height of the receiving unit apart from ground is higher than height of the projecting unit apart from ground, The reflective graphics generated on vehicle front ground or barrier for receiving test pattern, are sent to control unit;
Control unit, for judging whether vehicle front has barrier according to test pattern and reflective graphics, when there is barrier It determines the size of barrier and the position of barrier relative vehicle, and is determined whether to control vehicle deceleration according to the size of barrier Braking or turning avoidance.
2. automatic identification small obstacle according to claim 1 and the driving assistance system braked, it is characterised in that: institute State the method for judging whether vehicle front has barrier are as follows: be compared reflective graphics with test pattern, when there is reflectogram A certain region in shape is equivalent to the case where corresponding the same area is deformed in test pattern, it is determined that vehicle front has barrier Hinder object.
3. automatic identification small obstacle according to claim 1 and the driving assistance system braked, it is characterised in that: institute The method for stating the position of determining barrier relative vehicle are as follows: using test pattern center as origin, by test pattern, reflective graphics and Front of the car profile is placed in the same coordinate system, in the region that is deformed on reflective graphics apart from origin it is farthest be some barrier Hindering object position, definition barrier position is the first coordinate, and definition front of the car center position is the second coordinate, According to the position of the first coordinate and the second coordinate in a coordinate system, the position of barrier relative vehicle is determined by geometrical principle.
4. automatic identification small obstacle according to claim 1 and the driving assistance system braked, it is characterised in that: really Determine the method for the size of barrier are as follows: be calculated by the following formula multiple local location size c, more multiple parts on barrier The order of magnitude of position dimension is maximized the size as barrier,
C=a* [tan (γ-α)/tan (γ-β) -1]/[1-a*tan (γ-α)/b*tan (γ-β)],
Wherein a is height of the projecting unit apart from ground, and b is height of the receiving unit apart from ground, and c is barrier local location Size, α are receiving unit optical axis reflected ray corresponding with crosspoint each in the reflective graphics on the road surface there are barrier Between angle, β be receiving unit optical axis reflected ray corresponding with crosspoint each in the reflective graphics on smooth-riding surface it Between angle, angle of the γ between receiving unit optical axis and vertical direction, δ be test pattern in each crosspoint it is corresponding Angle between incident ray and vertical direction.
5. automatic identification small obstacle according to claim 1 and the driving assistance system braked, it is characterised in that: when When the size of barrier is more than or equal to setting value, the braking of control vehicle deceleration or the position control vehicle according to barrier relative vehicle Turning avoidance controls normal vehicle operation when the size of barrier is less than setting value.
6. automatic identification small obstacle according to claim 1 and the driving assistance system braked, it is characterised in that: institute Stating barrier is object or the road hole for protruding from ground, and the size of barrier is that depth is cheated on object height or road.
7. automatic identification small obstacle according to claim 1 and the driving assistance system braked, it is characterised in that: institute Stating the difference in height of projecting unit and receiving unit apart from ground is 0.5-1.5m.
8. automatic identification small obstacle according to claim 1 and the driving assistance system braked, it is characterised in that: institute It states projecting unit and receiving unit is located on same perpendicular.
9. a kind of automatic identification small obstacle and the driving auxiliary control method braked, it is characterised in that: to vehicle front Face projects test pattern, the reflective graphics that test pattern generates on vehicle front ground or barrier is received, according to standard drawing Shape and reflective graphics judge whether vehicle front has barrier, determine that the size of barrier and barrier are opposite when there is barrier The position of vehicle, and determined whether to control vehicle deceleration braking or turning avoidance according to the size of barrier.
10. driving auxiliary control method according to claim 9, it is characterised in that: described to judge whether vehicle front has The method of barrier are as follows: be compared reflective graphics with test pattern, when a certain region occurred in reflective graphics is equivalent to The case where corresponding the same area is deformed in test pattern, it is determined that vehicle front has barrier.
11. driving auxiliary control method according to claim 9, it is characterised in that: the determining barrier relative vehicle Position method are as follows: using test pattern center as origin, by test pattern, reflective graphics and front of the car profile place it is same In coordinate system, in the region that is deformed on reflective graphics apart from origin it is farthest be some barrier position, definition barrier Hindering object position is the first coordinate, and definition front of the car center position is the second coordinate, according to the first coordinate and second The position of coordinate in a coordinate system, the position of barrier relative vehicle is determined by geometrical principle.
12. driving auxiliary control method according to claim 9, it is characterised in that: the method for determining the size of barrier Are as follows: it is big to be calculated by the following formula multiple local location size c, the absolute value of more multiple local location sizes on barrier It is small, it is maximized the size as barrier,
C=a* [tan (γ-α)/tan (γ-β) -1]/[1-a*tan (γ-α)/b*tan (γ-β)],
Wherein a is height of the projecting unit apart from ground, and b is height of the receiving unit apart from ground, and c is barrier local location Size, α are receiving unit optical axis reflected ray corresponding with crosspoint each in the reflective graphics on the road surface there are barrier Between angle, β be receiving unit optical axis reflected ray corresponding with crosspoint each in the reflective graphics on smooth-riding surface it Between angle, angle of the γ between receiving unit optical axis and vertical direction, δ be test pattern in each crosspoint it is corresponding Angle between incident ray and vertical direction.
13. driving auxiliary control method according to claim 9, it is characterised in that: when the size of barrier is more than or equal to When setting value, control vehicle deceleration is braked or is avoided according to the position control Vehicular turn of barrier relative vehicle, works as barrier Size be less than setting value when, control normal vehicle operation.
CN201811155021.5A 2018-09-30 2018-09-30 Driving assistance system capable of automatically identifying small-sized obstacles and braking and control method Active CN109291922B (en)

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CN112644483A (en) * 2020-12-24 2021-04-13 宝能(西安)汽车研究院有限公司 Vehicle speed control method, readable storage medium, vehicle speed control device and vehicle
CN112606836A (en) * 2020-12-29 2021-04-06 科大讯飞股份有限公司 Driving assistance method and system

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