CN109552326A - A kind of vehicle speed variation cruise control method under radio communication channel decaying - Google Patents

A kind of vehicle speed variation cruise control method under radio communication channel decaying Download PDF

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Publication number
CN109552326A
CN109552326A CN201811306453.1A CN201811306453A CN109552326A CN 109552326 A CN109552326 A CN 109552326A CN 201811306453 A CN201811306453 A CN 201811306453A CN 109552326 A CN109552326 A CN 109552326A
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vehicle
speed
acceleration
cruise control
control
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CN109552326B (en
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宋秀兰
王轲
张昱
何德峰
孟利民
余世明
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Zhejiang University of Technology ZJUT
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Zhejiang University of Technology ZJUT
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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
    • B60W30/14Adaptive cruise control
    • 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
    • B60W50/00Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
    • 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
    • B60W50/00Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
    • B60W2050/0001Details of the control system
    • B60W2050/0019Control system elements or transfer functions
    • B60W2050/0028Mathematical models, e.g. for simulation
    • B60W2050/0031Mathematical model of the vehicle
    • 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
    • B60W2520/00Input parameters relating to overall vehicle dynamics
    • B60W2520/10Longitudinal speed
    • 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
    • B60W2520/00Input parameters relating to overall vehicle dynamics
    • B60W2520/10Longitudinal speed
    • B60W2520/105Longitudinal acceleration
    • 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
    • B60W2554/80Spatial relation or speed relative 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
    • B60W2554/00Input parameters relating to objects
    • B60W2554/80Spatial relation or speed relative to objects
    • B60W2554/804Relative longitudinal speed

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Human Computer Interaction (AREA)
  • Controls For Constant Speed Travelling (AREA)
  • Control Of Driving Devices And Active Controlling Of Vehicle (AREA)

Abstract

A kind of vehicle speed variation cruise control method under radio communication channel decaying, include the following steps: 1), establish three rank dynamic mathematical models of vehicle speed variation cruise control;2) it, definesObtain vehicle speed variation cruise control system state-space model;3), define vehicle radio communication channel decaying under speed change cruise system in t moment spacing, speed, acceleration control function;4) real number ρ, is given1, λ, solve real matrix And V, meet linear matrix inequality;5) range difference, speed difference and front truck acceleration that network obtains Ben Che and front truck by wireless communication calculate this vehicle acceleration, speed, distance controlling amount in real time, this vehicle is driven to track front truck motion state;So in cycles, the speed change cruise control of vehicle high real-time and accuracy under radio communication channel decaying is realized.The present invention considers the fading channel characteristic of vehicle in the process of moving, so that vehicle speed variation cruise control target be better achieved.

Description

A kind of vehicle speed variation cruise control method under radio communication channel decaying
Technical field
It is the present invention relates to a kind of vehicle speed variation cruise control method, in particular to a kind of under radio communication channel decaying Vehicle speed variation cruise control method.
Background technique
Vehicle speed variation cruise control is the vehicle traveling information that front truck and Ben Che are acquired by onboard sensor such as radar, Then vehicular safety distance, speed, acceleration model are established, the front truck of acquisition and Ben Che are travelled into information input model, control The speed, acceleration of this vehicle realizes a kind of method of controlling of this vehicle automatic Pilot.Vehicle speed variation cruise control makes driver Without having been at tense situation, safety and the comfort of driver driving are improved, while traffic congestion can be slowed down.But This method of controlling acquires the meeting of front truck information in bend section due to using trailer-mounted radar to acquire front truck driving information, for traveling There is certain inaccuracy, and onboard sensor is there are detecting distance range is smaller, it when the vehicle is driving at high speed, cannot be timely By preceding vehicle information feedback to this vehicle.With the continuous development of car networking technology, so that Real-Time Sharing vehicle between vehicle and vehicle Driving information becomes reality, on the basis of the control of original vehicle cruise, has investigated front truck through heterogeneous wireless network It is connected with this vehicle, on the one hand cordless communication network receives the driving information of preceding vehicle, on the other hand travel this vehicle and believe Breath is sent to preceding vehicle, travels on road, and vehicle is to realize vehicle stabilization cruise by wireless network connection with vehicle, This mode reduces the velocity perturbation between vehicle, can be realized and be cruised with the distance of very little, while can be in complex environment For example the biggish bend of camber ratio or the height backroad of fluctuating realize cruise control.
The control mode of transmission vehicle traveling information and then control vehicle must assure that wireless communication networks by wireless communication The safety and reliability of network, vehicle, which only has, receives correct information in driving process, could be under correct control strategy It realizes vehicle control, avoids that safety accident occurs.Radio communication channel decaying be influence car-to-car data transmission one it is important because Element, radio communication channel decaying will affect the control performance of system, the especially stability of system, and therefore, which needs Consider the decaying of wireless channel.It is found by the retrieval to the document of vehicle shifting control method under existing wireless communications, vehicle The radio communication channel lower speed change cruise control that decays mainly has: PID controller, HControl, fuzzy synovial membrane control.Wherein PID Control follow the bus under fading channel will appear violent shake, this has large effect for the comfortableness and security of follow the bus; Fuzzy synovial membrane control is a kind of control method for combining synovial membrane structure control and fuzzy structure control, the control method and PID Control method is compared, and shake has obtained certain improvement, but the variation of its simulation result such as speed is not still smoothly to become Change;HControlling model is more complicated, and calculation amount is also bigger.Therefore, the lower speed change cruise although radio communication channel is decayed Control research achieves some achievements, but many scholars have still carried out this problem careful research, so that control Method meets more complex environment and more accurate vehicle and carries out control requirement.
Summary of the invention
In order to solve the problems, such as vehicle speed variation cruise control, this hair due to caused by fading channel under wireless communications environment Bright to provide a kind of lower vehicle speed variation cruise control method of radio communication channel decaying, this method consideration vehicle is in driving process In letter radio communication channel attenuation characteristic, so that vehicle speed variation cruise control target be better achieved.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of lower vehicle speed variation cruise control method of radio communication channel decaying, the control method include walking as follows It is rapid:
1) three rank dynamic mathematical models of vehicle speed variation cruise control, are established, referring to formula (1):
Wherein, variable t is time, v0(t)、a0(t) velocity and acceleration of front truck is indicated;v1(t)、a1(t) this vehicle is indicated Velocity and acceleration;Speed difference and the acceleration for respectively indicating two vehicle of front and back are poor;Indicate the time of engine Constant;It is this vehicle range error d1(t) about the derivative of time and d1(t)=d0+h1v1, d0It is the minimum of two vehicle of front and back Distance, h1It is time response interval;u1(t) it indicates this vehicle and leading vehicle distance is poor, speed difference, this vehicle Acceleration Control function;
2) it, definesWherein β1a1Two spacing deviations, speed difference and rear car is respectively indicated to add Speed then obtains vehicle speed variation cruise control system state-space model by formula (1), referring to formula (2):
WhereinWith
3), define vehicle radio communication channel decaying under speed change cruise system in t moment spacing, speed, acceleration control Function processed, referring to formula (3):
Wherein, K1=[k1 k2 k3] it is control gain vector, k1、k2And k3Indicate the gain coefficient of control function, Δ v1For The speed difference of two vehicle of front and back, ρ2Indicate the attenuation coefficient of wireless channel;
4) real number ρ, is given1, λ, solve real matrixAnd V, meet linear matrix inequality, Referring to (4):
Wherein, matrix Then control gain vector
5) this vehicle that network obtains by wireless communication and leading vehicle distance be poor, speed difference and front truck acceleration calculate in real time This vehicle acceleration, speed, distance controlling amount drive this vehicle to track front truck motion state;At next control period, exist again Line measures range difference, speed difference and the front truck acceleration of front truck and this vehicle, so in cycles, realizes that vehicle is believed in wireless communication The speed change cruise control of high real-time and accuracy under road is decayed.
Technical concept of the invention is: for vehicle speed variation cruise control field to vehicular safety distance, speed, acceleration The accuracy and requirement of real-time of control establish vehicle three rank time dynamic models under wireless channel decaying, devise one The vehicle controller that vehicle speed variation cruises under radio communication channel decaying, calculates safe distance, the acceleration, speed of vehicle in real time Control amount, and then accurate real-time control vehicle are spent, realizes that vehicle speed change under radio communication channel decaying is cruised.
The main execution part of the present invention executes on Vehicular automatic driving control computer, and implementation procedure is broadly divided into Three phases:
1) including model parameter and controller parameter, the safe distance β that vehicle speed variation cruises, parameter setting: is set1, hair Motivation constantTime response interval h1, the attenuation coefficient ρ of radio communication channel2.Real parameters λ, ρ that controller is adjustable1, setting After parameter, store data into computer.
2) it, debugs the stage: being debugged according to the practical adjustable parameter of input, observation vehicle cruises system under fading channel The control effect united to vehicle, thereby determines that one group of preferable adjustable parameter λ, ρ1
3), on-line operation: starting vehicle cruise control system, the speed of front truck, position, acceleration pass through wireless isomer network Network is transferred to the cruise control system of this vehicle, calculates that two following distances are poor, speed difference, then calculates the speed of this vehicle cruise system Degree, Acceleration Control amount drive this vehicle to track front truck operating status, guarantee that vehicle speed change under fading channel is cruised.
Beneficial effects of the present invention are mainly manifested in: 1, the adjustable parameter of vehicle speed variation cruise control system is fewer, behaviour It makes comparisons conveniently.2, the decaying in radio communication channel is considered, the error of vehicle speed variation cruise control system is reduced, is guaranteed The accuracy and safety of speed change cruise, while but also the control system can be used for the scene of many complexity.
Detailed description of the invention
Fig. 1 is that the variation of the accident-free vehicle pitch difference of this vehicle and front truck is bent in speed change cruise control under wireless channel decaying for vehicle Line.
Fig. 2 is vehicle this vehicle acceleration change curve in speed change cruise control under wireless channel decaying.
Fig. 3 is that this vehicle controls input quantity to vehicle in speed change cruise control under wireless channel decaying.
Fig. 4 is this vehicle and front truck interval error change curve during vehicle speed change under wireless channel decaying is cruised.
Specific embodiment
Method of the invention is described in further details with reference to the accompanying drawing.
Referring to Fig.1~Fig. 4, a kind of lower vehicle speed variation cruise control method of wireless channel decaying, the control method include Following steps:
1) vehicle speed variation cruise control three-stage shape state space mathematical model, is established, referring to formula (1);
Wherein, variable t is time, v0(t)、a0(t) velocity and acceleration of front truck is indicated;v1(t)、a1(t) this vehicle is indicated Velocity and acceleration;Speed difference and the acceleration for respectively indicating two vehicle of front and back are poor;Indicate engine when Between constant;It is this vehicle range error d1(t) about the derivative of time and d1(t)=d0+h1v1, d0The minimum of two vehicle of front and back Distance, h1It is time response interval;u1(t) it indicates this vehicle and leading vehicle distance is poor, speed difference, this vehicle Acceleration Control function;
2) it, introducesWherein β1a1Respectively indicate two spacing deviations, speed difference and Ben Chejia Speed then obtains vehicle speed variation cruise control model by (1)
WhereinWith
3), define vehicle radio communication channel decaying under speed change cruise system in t moment spacing, speed, acceleration control Function processed
Wherein K1=[k1 k2 k3],k1, k2, k3Indicate the gain coefficient of control function, ρ2Indicate the decaying system of wireless channel Number, Δ v1For the speed difference of two vehicle of front and back, a0(t) acceleration of first car is indicated.Gain coefficient is controlled referring to following calculating;
4) real number ρ, is given1, λ, solve real matrixAnd V, meet linear matrix inequality, Referring to (4):
Wherein, matrix Then control gain vector
5) range difference, speed difference and front truck acceleration that network obtains Ben Che and front truck by wireless communication calculate in real time This vehicle acceleration, speed, distance controlling amount drive this vehicle to track front truck motion state;At next control period, exist again Line measures range difference, speed difference and the front truck vehicle acceleration of front truck and this vehicle, so in cycles, realizes that vehicle is wirelessly communicating The speed change cruise control of high real-time and accuracy under fading channel.
The present embodiment is the vehicle control process that vehicle speed variation cruises under wireless channel decaying, and operating process is as follows:
1, λ=- 0.8, ρ are inputted1=0.25, fading channel ρ2=0.97, this car engine constantTime response It is spaced h1=2s, 0 to 6 seconds acceleration a of front truck0(t)=1m/s2, a later0(t)=0m/s2, minimum range d between two vehicles0= 8m。
2, the control coefrficient K of automobile variable speed cruise system is calculated by the calculation procedure write1, by input Parameter substitutes into (4), finds out and meets MATRIX INEQUALITIES
V=[0.1186 0.0510 0.0667]
Then control coefrficient K is calculated by (4)1=[0.6406 0.3661-0.0049].
3, after obtaining control coefrficient, by wireless communication network obtain the range difference of Ben Che and front truck, speed difference and Front truck acceleration calculates this vehicle acceleration, speed, distance controlling amount in real time, this vehicle is driven to track front truck motion state;Next When a control period, range difference, speed difference and the front truck acceleration of on-line measurement front truck and this vehicle again, so in cycles, Realize the speed change cruise control of vehicle high real-time and accuracy under radio communication channel decaying.
Actual Control Effect of Strong is as shown in Figure 1, Figure 2, Figure 3, Figure 4, and Fig. 1 is that vehicle speed change under radio communication channel decaying is patrolled Practical following distance change curve in boat control;Fig. 2 is vehicle Ben Chejia in speed change cruise control under radio communication channel decaying Speed change curves;Fig. 3 is vehicle speed change cruise control input quantity change curve under radio communication channel decaying, and Fig. 4 is nothing This vehicle and front truck interval error change curve in the lower speed change cruise of line communication channel decaying.
Described above is the excellent vehicle that is shown of one embodiment for providing of the present invention in radio communication channel Decay lower speed change cruise system control effect.It may be noted that above-described embodiment is used to illustrate the present invention, rather than to this hair It is bright to be limited, within the spirit of the invention and the scope of protection of the claims, to any modification that the present invention makes, both fall within Protection scope of the present invention.

Claims (1)

1. the vehicle speed variation cruise control method under a kind of radio communication channel decaying, which is characterized in that the control method packet Include following steps:
1) three rank dynamic mathematical models of vehicle speed variation cruise control, are established, referring to formula (1):
Wherein, variable t is time, v0(t)、a0(t) velocity and acceleration of front truck is indicated;v1(t)、a1(t) speed of this vehicle is indicated Degree and acceleration;Speed difference and the acceleration for respectively indicating two vehicle of front and back are poor;Indicate that the time of engine is normal Number;It is this vehicle range error d1(t) about the derivative of time and d1(t)=d0+h1v1, d0It is the most narrow spacing of two vehicle of front and back From h1It is time response interval;u1(t) it indicates this vehicle and leading vehicle distance is poor, speed difference, this vehicle Acceleration Control function;
2) it, definesWherein β1a1Two spacing deviations, speed difference and rear car is respectively indicated to accelerate Degree, then obtain vehicle speed variation cruise control system state-space model by formula (1), referring to formula (2):
WhereinWith
3), define vehicle radio communication channel decaying under speed change cruise system t moment spacing, speed, acceleration control letter Number, referring to formula (3):
Wherein, K1=[k1 k2 k3] it is control gain vector, k1、k2And k3Indicate the gain coefficient of control function, Δ v1For front and back The speed difference of two vehicles, ρ2Indicate the attenuation coefficient of wireless channel;
4) real number ρ, is given1, λ, solve real matrixAnd V, meet linear matrix inequality, referring to (4):
Wherein, matrix Then control gain vector
5) range difference, speed difference and front truck acceleration that network obtains Ben Che and front truck by wireless communication calculate this vehicle in real time Acceleration, speed, distance controlling amount drive this vehicle to track front truck motion state;It is again online to survey at next control period Range difference, speed difference and the front truck acceleration of front truck and this vehicle are measured, so in cycles, realizes that vehicle declines in radio communication channel Subtract the speed change cruise control of lower high real-time and accuracy.
CN201811306453.1A 2018-11-05 2018-11-05 Vehicle variable speed cruise control method under wireless communication channel attenuation Active CN109552326B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110569602A (en) * 2019-09-10 2019-12-13 中国科学技术大学 Data acquisition method and system for unmanned vehicle
CN111221341A (en) * 2020-02-16 2020-06-02 翟桂芳 Safe driving control method for automatic driving vehicle and vehicle-mounted controller
CN113696892A (en) * 2021-08-13 2021-11-26 浙江零跑科技股份有限公司 Self-adaptive cruise sliding mode control method for vehicle

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JP2008140139A (en) * 2006-12-01 2008-06-19 Mazda Motor Corp Vehicle planning support system, vehicle planning support program, and vehicle planning assistance method
US20110022284A1 (en) * 2009-07-21 2011-01-27 Denso Corporation Acceleration control device
CN104781112A (en) * 2012-08-16 2015-07-15 捷豹路虎有限公司 Improvements in vehicle speed control
CN107380165A (en) * 2017-07-27 2017-11-24 浙江工业大学 Vehicle distance control method in vehicle self-adaptive speed change cruise process

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CN1940591A (en) * 2005-09-26 2007-04-04 通用汽车环球科技运作公司 System and method of target tracking using sensor fusion
JP2008140139A (en) * 2006-12-01 2008-06-19 Mazda Motor Corp Vehicle planning support system, vehicle planning support program, and vehicle planning assistance method
US20110022284A1 (en) * 2009-07-21 2011-01-27 Denso Corporation Acceleration control device
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110569602A (en) * 2019-09-10 2019-12-13 中国科学技术大学 Data acquisition method and system for unmanned vehicle
CN110569602B (en) * 2019-09-10 2022-04-19 中国科学技术大学 Data acquisition method and system for unmanned vehicle
CN111221341A (en) * 2020-02-16 2020-06-02 翟桂芳 Safe driving control method for automatic driving vehicle and vehicle-mounted controller
CN111221341B (en) * 2020-02-16 2021-02-05 深圳市京弘全智能科技股份有限公司 Safe driving control method for automatic driving vehicle and vehicle-mounted controller
CN113696892A (en) * 2021-08-13 2021-11-26 浙江零跑科技股份有限公司 Self-adaptive cruise sliding mode control method for vehicle
CN113696892B (en) * 2021-08-13 2023-01-31 浙江零跑科技股份有限公司 Self-adaptive cruise sliding mode control method for vehicle

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