218results about How to "Avoid rear-end accidents" patented technology

The invention relates to an 802.11p and LTE/LTE-A based vehicle networking message propagation method, which is characterized in that a GPS information collection module collects the running speed, the running direction and positional information of a vehicle, a 802.11p communication module of a vehicle which is in the same road section and runs in the same direction and a 802.11p communication module located in an effective communication range form an Ad hoc network, vehicles in the Ad hoc network form a vehicle cluster, the cluster head sends a secure message to an LTE/LTE-A base station at a scheduled time interval, and the LTE/LTE-A base station updates a road table of the vehicle cluster; in an emergency case, vehicles in the same vehicle cluster use the 802.11p communication module to carry out message broadcasting, the cluster head sends the message to the LTE/LTE-A base station, and the LTE/LTE-A base station broadcasts the message to the cluster head of a related vehicle cluster according to the vehicle cluster road table. The 802.11p and LTE/LTE-A based vehicle networking message propagation method has the advantages of high practicability, low deployment cost and the like.

The invention relates to a vehicle multi-target coordinating lane changing assisting adaptive cruise control method. The method comprises the following steps that 1) LCACC combination property indexes are set according to two-front-vehicle traceability, multi-vehicle movement safety and longitudinal driving comfort requirements, and the LCACC combination property indexes comprise a cost function and I/O constraints; 2) a multi-target coordinating optimal control problem is built, solving is carried out through a rolling time domain optimization algorithm, the optimal control quantity is obtained, and optimal control is achieved. The LCACC cost function is set according to the following steps that a) a traceability cost function is built through a two-norm linear combination of the vehicle distance errors and vehicle speed errors of the own vehicle and two front vehicles; b) a comfort cost function is built by restraining longitudinal acceleration. The LCACC I/O constraints are set according to the steps that a) in the respect of tracking performance, vehicle following error constraints which are used for limiting the vehicle speed errors and the vehicle distance errors and allowed by a driver are obtained through driver experimental data in a statistic mode; b) in the respect of safety performance, the safety distance between the own vehicle and multiple surrounding vehicles is restrained in the view of vehicle following and collision avoidance; c) in the respect of comfort performance, the expected longitudinal acceleration data range is restrained.

The invention discloses a rear-end early warning method based on the Bayesian network. The weather situation Y1, the road situation Y2, the driver reaction time Y3, the distance between the rear car and the front car Y4, the rear car speed Y5, the speed difference of the rear car relative to the front car Y6, and the rear car acceleration Y6 are selected as the variable nodes of the rear-end accident Y8, the Bayesian network node collection Y:Y={Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8} of the rear-end accident is obtained, and value ranges of the variable nodes are determined; the traffic scene of the rear-end accident is simulated, the Bayesian network learning dataset of the rear-end accident is composed, and discrete treatment is performed on the learning dataset; the Bayesian network structure of the rear-end accident is composed, and conditional probability distributions of the nodes in the structure are calculated; the inspection data sample is obtained, the values of all nodes in the inspection data sample except the rear-end accident Y8 in next moment are predicted; the Bayesian network is utilized to calculate the probability that a rear-end accident happens in the next moment; the threshold value is set, and the early warning measure is adopted if the probability that the rear-end accident happens is larger than the threshold value.

The invention relates to the technical field of vehicle safety, in particular to a warning method and system for avoiding vehicle rear-end collision. The method provided by the invention comprises thesteps of collecting vehicle state information according to sensor signals and converting state information into digital signals to be input into a central processing unit, judging whether the digitalsignal value exceeds a preset threshold value; if not, returning to step 2, and if yes, performing the next step; selecting a corresponding warning signal from a voice file, outputting to a voice circuit and giving out the warning signal. The system provided by the invention is composed of an acceleration transducer, a speed sensor, other sensors, a voice file, a voice module, a power amplifier circuit, a loudspeaker, a central processing unit and the like. When faults, such as tire burst, collision, roll over, secondary rear-end collision and the like, occur to a vehicle, the invention can notice a rear vehicle of the state of the vehicle with voice, can effectively prevent rear-end collision from occuring in severe weather and ensures the life safety of a driver.

The invention relates to a driver identity authorization system for a shared vehicle. The system at least comprises an intelligent terminal which is carried by a non-specific user and is in an intelligent communication equipment form as well as a vehicle device provided with vehicle-mounted equipment. A user utilizes the interaction of the intelligent terminal and the vehicle-mounted equipment to acquire the using permission of the shared vehicle. The vehicle-mounted equipment at least comprises an identification module, a verification module, a test terminal and an authorization module, wherein the identification module is used for starting the system; the verification module is used for calculating a first safety level parameter based on the extracted historical driving information of the user and the detected real-time physiological information of the user; the test terminal is used for testing the driving capability of the user by showing a simulated road to the user as well as calculating a second safety level parameter based on the indexes acquired by classified analysis of the driving capability of the user; and the authorization module is used for determining the driving permission of the user based on the first safety level parameter and the second safety level parameter by adopting a weighting method as well as adjusting the user authorization based on the driving permission.

The invention relates to an intelligent brake early-warning system which comprises a main control device, a human-computer interaction device, an information acquisition device, a distance measurement device, a display device, a sound and light alarm device and a communication device. The information acquisition device is used for acquiring the vehicle speed and the traffic information; the distance measurement device is used for monitoring the distance between a vehicle in the rear and a vehicle and the relative speed in real time; the main control device is used for carrying out analysis, processing and judgment on data collected by the human-computer interaction device, the information acquisition device and the distance measurement device and transmitting a command signal to the display device and the sound and light alarm device, thereby realizing a three-section early-warning function. The intelligent brake early-warning system starts from active defense, makes up the defect of active safety configuration of an automobile in the present society and has the advantages of low cost, high precision, flexibility in arrangement, good stability and the like.

The invention discloses an expressway turning segment variable velocity-limiting control method. A traffic flow detector is installed on the downstream of an expressway turning segment. A road-side variable information prompt board is installed on the upstream of the expressway turning segment. An optimal uphill speed limit value on an expressway turning segment is chosen through calculation to propagation velocity of traffic jam waves. Consequently, the expressway turning segment variable velocity-limiting control method achieves the purpose that a driver can carry out variable speed control on the condition that the driver has poor sight distance on the expressway turning segment, enables the driver to slow down to the safety vehicle speed in advance before the driver drives a vehicle into the expressway turning segment, thereby avoiding rear-end collisions caused by traffic jam on the downstream. The expressway turning segment variable velocity-limiting control method is attached to actual traffic flow characteristic, is easy and convenient to implement, and has wide engineering value and good application prospect in preventing the rear-end collisions on the condition that the driver has poor sight distance on the expressway turning segment.

The invention discloses a genetic algorithm optimization-based vehicle rear-end collision fuzzy control method. The genetic algorithm optimization-based vehicle rear-end collision fuzzy control method is performed by a dual-input and single-output fuzzy controller. Relative distance error ds and relative speed error dv are selected to serve as input variables of the fuzzy controller, and accelerated speed Fad control amount which is actually output serves as an output variable. A genetic algorithm optimization fuzzy control rule is used, so that the performance of a vehicle control system is improved, the response speed is high, the avoidance of occurrence of a rear-end collision accident is facilitated, the energy consumption of a vehicle is reduced, and the control effect on collision avoidance is achieved.

The invention discloses a dynamic warning method for preventing automobile rear-end collision. The method comprises the steps that distance measurement result data are output through a millimeter-wave radar in each automobile, the distance measurement result data is processed, and a real distance d between an automobile and an automobile in front of the automobile is confirmed; anticollision monitoring is conducted on automobiles according to the real distance d of automobiles; all the automobiles send respective geographical location information and the real distance d to a cloud server, the cloud server judges the position relationships of the automobiles according to the geographical location information sent by automobiles, and when the real distance d of one automobile is smaller than a second safe distance, a second anticollision alerting signal is sent to the automobile and surrounding automobiles. The dynamic warning method for preventing automobile rear-end collision has the advantages that monitoring is accurate, the implement cost is comparatively low, and the use is convenient and practical.

The invention discloses a vehicle alarm system which comprises a DSP control chip, a detection unit and an alarm unit. The detection unit judges whether a moving target exists in a preset scope at back of a vehicle or not according to a detection command of the DSP control chip, the moving target is detected when the detection unit judges that the moving target exists in the preset scope, and a first detection signal obtained by detection is supplied to the DSP control chip through the detection unit; the DSP control chip judges whether a door opening early alarm is required or not according to the first detection signal provided by the detection unit, and a door opening alarming signal is supplied to the alarm unit through the DSP control chip if the DSP control chip judges that the door opening early alarm is required; the alarm unit gives an alarming prompt to a user in the vehicle according to the door opening alarming signal provided by the DSP control chip. According to the vehicle alarm system, vehicle accidents caused by vehicle door opening ate avoided, and the use safety performance of the vehicle is improved. In addition, a passenger is not required to watch the state at back of the vehicle before getting off the vehicle, and better riding comforts are provided for the passenger.

The invention discloses a high-mount brake lamp control system and a control method thereof. The control system comprises three groups of high-mount brake lamps, a control part and a deceleration sensor; wherein, the first high-mount brake lamp group and two common brake lamps are controlled by a brake switch and lit at the moment when the brake pedal is trod; the second high-mount brake lamp group is co-controlled by a brake switch and a brake deceleration, and lit when the brake deceleration ranges from 0.2g to 0.5g after the brake pedal is trod; the third high-mount brake lamp group is also co-controlled by a brake switch and a brake deceleration, and lit when the brake deceleration is greater than 0.5g after the brake pedal is trod. The system can lighten the high-mount brake lamps by grades according to the brake situation of vehicles, thus the brake situation of front vehicles can be fed back to the driver of the rear vehicle and the driver can take proper measures to avoid the rear-end collision according to the lightening situation of the brake lamps.

The invention discloses an automobile rear-ending avoidance alarming device and method. The alarming device comprises a millimeter wave radar, a single chip microcomputer and an alarming indicating unit, wherein the alarming indicating unit is composed of a lamp driving circuit and an alarming indicator lamp; the single chip microcomputer can output control signals to the lamp driving circuit the positions and speeds of the automobile as well as an automobile ahead, which are collected by the millimeter wave radar. By means of the positions and speeds of the automobile and the automobile ahead and a trained Sugeno-type fuzzy inference system model loaded in the single chip microcomputer, the alarming method can help obtain an expected acceleration of the automobile, when the single chip microcomputer determines that the expected acceleration is smaller than a set acceleration, the single chip microcomputer outputs control signals to drive the alarming indicator lamp to flicker and accordingly to timely issue alarm to the driver of the rear automobile before the automobile brake suddenly, so that the rear-ending accident due to untimely reaction of the driver of the rear automobile can be effectively avoided, further driving security can be enhanced.

The embodiment of the invention relates to the technical field of vehicles and discloses a vehicle rear-end collision prevention control method and a vehicle control system. The method comprises the following steps of: when detecting that a subsequent vehicle exists behind a target vehicle, the vehicle control system judges whether a collision risk exists between the subsequent vehicle and the target vehicle or not; if yes, the vehicle control system judges whether the adjacent area of the target vehicle has a drivable condition or not, and if yes, the vehicle control system plans the expectedtraveling track of the target vehicle and controls the target vehicle to travel according to the expected traveling track so that the target vehicle can avoid the following vehicle. By implementing the embodiment of the invention, rear-end collision accidents can be avoided.

The invention relates to a rear-end collision prevention early warning system and a method based on the braking habit of a front vehicle driver. The system consists of self-driving system and back-driving system. The self-driving system consists of sensor module, information acquisition unit, driving habit analysis unit, safe vehicle distance real-time calculation unit, early warning and remindingunit and vehicle networking communication unit. The sensor module consists of laser radar sensor and brake switch. The rear vehicle system is composed of an early warning reminder unit, an information processing unit, an information display unit and a vehicle networking communication unit. The information display unit is directly connected to the serial port 1 of the processor, and the vehicle networking communication module is directly connected to the serial port 2 of the processor. The method comprises the following steps: real-time recording the information of the vehicle speed, the engine speed, the brake switch state and the accelerator pedal stroke; After calculating the real-time driving speed v of the rear car; Real-time Calculation of Theoretical Safety Distance between Self-propelled Vehicle and Rear Vehicle; Warn from the vehicle to the rear. The invention can reduce the probability of rear-end collision accident.

The embodiment of the invention provides a train safety tracking protection method and device based on relative speed, and the method comprises the steps: 1, respectively obtaining the safety space-time track information of a train in a parking process through tracking running front train and rear train in combination with the performances of the trains through an electronic map and autonomous speed measurement positioning information; 2, acquiring the safe space-time track information of the front train by the rear train in an inter-vehicle communication mode; 3, allowing the rear train to combine the safe space-time track information of the front train and the rear train, establishing safety conditions according to the constraint that the position of the rear train cannot exceed the position of the front train at any moment, and solving the EBI speed triggered by emergency braking of the rear train; and 4, allowing the rear vehicle to compare whether the current measurement speed v2(t0) of the rear vehicle exceeds the EBI speed E2(t0) of the rear vehicle or not; and if v2(t0) is larger than E2(t0), outputting an emergency braking instruction, and decelerating the rear vehicle tobe stopped.

The invention discloses an expressway crest vertical curve road segment variable velocity-limiting control method. A traffic flow detector is arranged on a downhill segment. A road-side variable information prompt board is arranged on an uphill segment. An optimal uphill speed limit value on an expressway crest vertical curve road segment is chosen through calculation to propagation velocity of traffic jam waves. Consequently, the expressway crest vertical curve road segment variable velocity-limiting control method achieves the purpose that a driver can carry out variable speed control on the condition that the driver has poor sight distance on the expressway crest vertical curve road segment, enables the driver to slow down to the safety vehicle speed in advance before the driver drives a vehicle into the expressway crest vertical curve road segment, thereby avoiding rear-end collisions caused by traffic jam on the downhill segment. The expressway crest vertical curve road segment variable velocity-limiting control method is attached to actual traffic flow characteristic, is easy and convenient to implement, and has wide engineering value and good application prospect in preventing the rear-end collisions on the condition that the driver has poor sight distance on the expressway crest vertical curve road segment.

The invention aims at providing an automobile emergency brake alarm system and a control method thereof. The automobile emergency brake alarm system can timely and clearly notify vehicles, behind a vehicle performing brake, of the brake situation of the vehicle through a brake display lamp, thereby preventing the occurrence of rear-end collision accidents. The automobile emergency brake alarm system provided by the invention comprises a display device, an acceleration detection device, a brake pedal position detection device and a controller, wherein the controller is used for receiving signals of the acceleration detection device and the brake pedal position detection device, and controlling the display of the display device according to the signals. The control method of the automobile emergency brake alarm system is as follows: receiving the signals of the acceleration detection device and the brake pedal position detection device through the controller, and controlling the display device to display that the vehicle is in an emergency brake state by the controller when a brake pedal is trampled down and acceleration exceeds the preset acceleration.

The invention discloses a rail train rear-end collision preventing system based on opened frequency band communication, and the rail train rear-end collision preventing system is characterized in that a train wheel comprises a wheel axle pulse sensor for collecting pulse generated by the rotation of a wheel axle; and a train comprises a positioning module, a first wireless digital transmission module, a second wireless digital transmission module, a distance calculation module, a warning module and a brake module, wherein the positioning module is connected with the wheel axle pulse sensor and used for calculating a position of the train; the first wireless digital transmission module is used for transmitting position information of the train to a train behind the train through a wireless signal of an opened frequency band; the second wireless digital transmission module receives the position information of a train in front of the train through a wireless signal of the opened frequency band; the distance calculation module is used for calculating the distance between two trains; the warning module is used for issuing alarm information when the distance of the two trains is less than a first preset value; and the brake module is used for emergency braking when the distance of the two trains is less than a second preset value. Through the rail train rear-end collision preventing system, a certain safe distance can be maintained between a front train and a behind train, which run on a rail, while the communication cost is saved and the communication stability is improved, and the rear-end collision accident of trains can be avoided.

The invention provides a method and a device for preventing vehicle collision, relates to the technical field of automobiles, and can effectively avoid rear-end collision. The method comprises the following steps of detecting a running distance between a vehicle and another vehicle in front of the vehicle; determining whether rear-end collision possibly happens between the vehicle and the front vehicle or not according to the detected running distance between the vehicle and the front vehicle, and limiting the speed of the vehicle if the rear-end collision possibly happens. The method and the device can be applied to an anti-collision technology for vehicles.

The invention provides an oscillatory type automobile rear-end alarming device and belongs to the field of safe driving assisting technology of automobile. The invention comprises an alarm controller and an oscillatory type pedal mechanism. The alarm controller comprises a CAN communication module, a microprocessing unit and a drive circuit. PCANtx and PCANrx pins of the CAN communication module PCA82C250 are connected with PCANtx and PCANrx pins of the SCM of the microprocessing unit MC9S08DZ60. The CAN communication module is provided with a general-purpose type interface, and can be incorporated into a vehicle-mounted CAN network. The input PWM1 of the drive circuit SN7407N is connected with the corresponding output of the microprocessing unit. The output port of the drive circuit is connected with the motor of the pedal mechanism. The invention gives an alarm through the vibration of feet of a driver with little influence on the driver. Graded alarm can be adopted; the mechanical structure is simple and can be achieved easily with low cost, and the invention is highly compatible and humanized, and facilitates processing and refitting of large quantities.

The invention discloses a vehicle-mounted terminal of an intelligent transportation system based on the Internet of things and a dynamic three-dimensional geographic information system (3D GIS). The vehicle-mounted terminal comprises a wireless communication module, an information storage module, a road condition collecting instrument, a port matched with a vehicle body automatic control system, an electromagnetic buffer device, a 3D GIS module and a control unit, wherein the wireless communication module, the information storage module, the road condition collecting instrument, the port, the electromagnetic buffer device and the 3D GIS module are connected with the control unit. The control unit is used for processing and analyzing instructions sent by a server, real-time three-dimensional information, road condition information sent by a road monitoring device and three-dimensional information sent by the vehicle-mounted terminal of each transportation participation body, and sending instructions to the port matched with the vehicle body automatic control system and the electromagnetic buffer device. According to the vehicle-mounted terminal, comprehensive road condition information is learned about conveniently, effective management of transportation is achieved, stable driving of the vehicle-mounted terminal is guaranteed, crash and rear-end collision accidents between vehicles are avoided, and geographic data are formed conveniently.