1543 results about "Braking distance" patented technology

A vehicle driving assisting apparatus determines whether a driver is executing a driving operation for stopping a vehicle when a distance up to a halting vehicle exiting in front of the vehicle is shorter than a distance obtained by adding a margin to an estimated braking distance for stopping the vehicle by starting a normal deceleration operation from the present vehicle speed. When the driving operation for stopping the vehicle has not been executed, an alarm is generated for causing the driver's attention in the forward direction. This makes it possible to properly determine the driver's degree of recognition of the traffic environment in front of the vehicle.

In a vehicular control device, it is necessary to measure or calculate six physical quantities-forward-reverse speed, left-right speed, vertical speed, pitch angle, roll angle, and angle of sideslip-representing vehicular movement and to control the braking force of each wheel and/or the damping coefficient of each suspension shock absorber in order to further shorten braking distance particularly at the time of braking and to prevent spin at that time. In this case, it is necessary to furnish sensors to measure speed and angle directly. In the present invention, four radar sensors are used in order to directly measure the forward-reverse speed and the left-right speed. Also, the vertical speed, the pitch angle, the roll angle, and the angle of sideslip are indirectly measured from the output of the radar sensors. By using three or four radar sensors, six physical quantities-the forward speed, the left-right direction speed, the vertical speed, the angle of sideslip, the pitch angle, and the roll angle-can be measured. Also, by using two radar sensors, three physical quantities-the forward speed, the left-right speed, and the angle of sideslip-can be measured.

The invention concerns a process for shortening the braking distance of a vehicle equipped with a brake servo unit which during a standard braking action is only triggered by the brake pedal pressure caused by the driver and in case of a critical driving situation is so triggered by a control device that in comparison to the standard braking action an increased amplification factor is set at the brake servo unit. The invention distinguishes itself by the fact that a danger potential is determined, stating the probability that the vehicle to be braked will be involved in an accident and that the increase of the amplification factor is controlled in accordance with the danger potential.

The invention relates to an initiative anticollision self-adapting fuzzy control method for a vehicle. The method comprises the following steps: measuring the relative speed of a self vehicle and a front vehicle and the speed of the self vehicle respectively by a radar speed measurement sensor and a hall vehicle speed sensor on the self vehicle; according to the situations of weather, road surfaces, vehicle types and loads and manual input information, obtaining the largest braking deceleration that the self vehicle and the front vehicle possibly achieve, and at the same time, according to a distance between the two vehicles, dividing the control behavior of the self vehicle into four grades; and comparing the actual distance D between the two vehicles, measured by a radar distance measurement sensor, with a safe vehicle following distance, a warning distance, a fuzzy control automatic brake distance and an emergency braking distance, and determining which section the actual distance between the vehicles falls into, so as to make a corresponding action. According to the method disclosed by the invention, a control system can be adjusted in a self-adapting manner without changing a fuzzy control rule list and a fuzzy control algorithm list, so that the control system can be adaptive to the changes of the situations of individual types of drivers, the weather, the road surfaces, the vehicle types, the loads and the like, and the stability, the reliability and the robustness of automatic brake are maintained.

A vital radio based automatic train control system that will interface seamlessly with existing onboard ATC equipment via existing track receiver inputs or directly. The invention provides a means of extending ATC signal territory with reduced equipment installation as compared to traditional cab or wayside based ATC. The invention can be used to reduce train braking distances and reduce headway. Furthermore, the radio cab signal can be used for additional purposes including but not limited to wayside equipment monitoring and rolling equipment monitoring.

The invention discloses an automobile active anti-collision automatic lane change control system and an operating method thereof. The system comprises a real-time driving safety state judging module and an automatic lane change control module which are connected with each other; the real-time driving safety state judging module comprises a critical braking distance calculation module and a safety state judging module unit; the automatic lane change control module comprises a lateral dynamics and CarSim vehicle dynamics model establishing module, an expected yaw velocity acquiring module and a design terminal sliding formwork lane change controller module. The method includes two steps of driving safety state judgment and automatic lane change control. The system and method adopt pedestrians in front as the study objects of active anti-collision, whether driving is in the dangerous state or not can be judged by calculating the critical braking distance and corresponded automatic control is performed, the smoothness and operating stability during lane change are guaranteed, and safety of the pedestrians in front is guaranteed.

The invention discloses a vehicle rear-end collision warning and protecting method, which comprises the following steps that the rear-vehicle relative vehicle speed V1 and the rear-vehicle relative distance S1 are measured in real time; the self-vehicle absolute vehicle speed V2 and the wheel rotating speed W are measured in real time; the rear-vehicle absolute speed V is obtained through calculation according to the self-vehicle absolute vehicle speed V2 and the rear-vehicle relative vehicle speed V1 in accordance with a formula that V=V1+V2; the tire slippage rate Delta is calculated by utilizing the self-vehicle absolute vehicle speed V2 and the wheel rotating speed W, and further, the current pavement attachment coefficient K is calculated; the rear-vehicle real-time brake distance S2 is obtained through calculation according to the rear-vehicle absolute speed V and the current pavement attachment coefficient K; the safe distance S between the two vehicles is calculated in accordance with a formula that S=S2-S1; and the judgment is carried out according to the safe distance S and the rear-vehicle relative distance S1, and warning information is issued and/or a vehicle rear protection air bag is propped out according to judgment results.

The invention relates to a multifunctional braking power testing platform which comprises the components of a base; a power and inertia chamber which is arranged on the base and comprises a power unit and a mechanical inertia unit; a first testing chamber which is arranged on the base and is mounted on one end of the power and inertial chamber; and a second testing chamber which is arranged on the base and is mounted on the other end of the power and inertia chamber, wherein a first braking device in the first testing chamber is different from a second braking device of the second testing chamber. The multifunctional braking power testing platform can be used for disc braking, tread braking, eddy current braking or magnetic rail braking tests of high-speed train and other rail vehicles, thereby reproducing a braking energy conversion process in a 1:1 manner and testing braking performance in real time.

The invention relates to a method and a device of railway roadblock detection and alarm based on radar return characteristics. When a train drives at a high speed, a radar detector abstracts the radar return characteristics of the front road surface in real time. According to information of the train position supplied by a global position system (GPS) inertial navigation system, a data processing and display and control and warning platform reads previous echo characteristic statistical data of the train at safe driving from a memorizer, and compares the train position information with the previous echo characteristic statistical data. If the echo characteristics have abnormal fluctuation, a system can send out a warning signal, and sufficient processing time is supplied to a driver on the premise of guarantee of a safe brake distance. A millimeter-wave radar related in the railway roadblock detection and alarm device is long in detection distance, and high in resolution ratio, can obtain information of the front road surface through real-time processing of the signals, can not be affected by weather and climate, is simple an practical in system, and can meet requirements for roadblock detection.

The invention discloses a system for preventing automobile end collision in a foggy day. The system performs heat detection on a vehicle ahead by utilizing infrared ray with infrared wavelength of 8-14mum and stronger rain and fog penetrability so as to see clearly the forward vehicle which cannot be seen or seen clearly by eyes, thus the system is particularly applicable to distance measurement of the vehicle ahead in a foggy day. In addition, the system judges the distance between the current vehicle and the vehicle ahead on the basis of distance L' when the two vehicles stop completely, namely, on the basis of the actually calculated distance between the current vehicle and the vehicle ahead and in consideration of the speeds of the current vehicle and the vehicle ahead, the complete brake distances of the current vehicle and the vehicle ahead as well as running distance within response time of a driver are calculated for judging the distance between the current vehicle and the vehicle ahead, thus obtaining more accurate normal distance or warning alarms with different urgency degrees, and avoiding automobile end collision accidents in a foggy day.

The invention discloses a control method and an intelligent device applied to a pilotless automobile. The specific embodiment of the method comprises the steps of receiving a driving habit selection instruction input by a user; obtaining driving habit information corresponding to the driving habit selection instruction, wherein the driving habit information comprises a driving route, a driving speed, acceleration time, deceleration time and a braking distance; and controlling the pilotless automobile on the basis of the driving habit information. On one hand, the automobile is automatically controlled to drive by the collected driving habit information of the user, the operation in the driving process is simplified, and the driving habit information can be shared with other users; on the other hand, the pilotless automobile can be controlled by the obtained driving habit information of a professional driver, while the driving stability and safety of the automobile are improved, and the optimization cost of operation and control of the pilotless automobile is reduced.

The invention provides a rotating wheel falling prevention device of an attachment type raise scaffold and a working method thereof. The rotating wheel falling prevention device is provided with a guide rail and a guide holder, wherein the guide holder is connected with a guide rail sliding sleeve, the guide rail is provided with spaced cross rods, the guide holder is provided with a rotating wheel which can be meshed with the cross rods in a transmission way, the rotating wheel is provided with a falling prevention clamping wheel, and a shaft seat of the rotating wheel is provided with swing needles by which the rotating wheel falling prevention device of the falling prevention clamping wheel, which reversely and fast rotates, can be braked; the falling prevention swing needles slowly swing and reset and the falling prevention clamping wheel slowly rotates during the slow raise and decline process of the scaffold so as to enable the raising or declining work of a scaffold body to be normally operated; when a scaffold body is suddenly declined, the rotating wheel generates high reverse rotation speed to enable the falling prevention swing needles not to be reset in time, thus the falling prevention swing needles clamp the falling prevention clamping wheel so as to enable the rotating wheel not to continuously reversely rotate, and the rotating wheel clamps the cross rods arranged on the guide rail so as to prevent the scaffold from continuously falling. The invention has the advantages of short braking distance, flexibility, reliability, difficult clamping, relative lower manufacturing accuracy and safe and reliable use.

The invention discloses a brake control device for a rail transit vehicle and an electro-pneumatic hybrid braking control method of the brake control device. A train braking management unit receives commands from a train management unit to calculate percentage signals of braking force needing to be produced by electric braking and percentage signals of braking force needing to be produced by friction braking respectively; a local network segment braking management unit collects the percentage signals transmitted by the train braking management unit and transmits electric braking force percentage signals to traction control units, and recalculates percentage signals of friction braking force needing to be produced by local friction brake control units according to a maximum available electric braking force value transmitted by the traction control units and an actually applied electric braking force value; the traction control units are used for applying electric braking force according to electric braking percentage signals; and the local friction brake control units are used for applying friction braking force according to friction braking percentage signals. Through the adoption of the brake control device and the electro-pneumatic hybrid braking control method thereof disclosed by the invention, the risk of an overlong braking distance due to insufficient braking force can be reduced, and the economical efficiency is good.

A system and method for onboard train detection is disclosed. In some embodiments, the train detection function is segregated into a safety-critical head-of-train determination, a safety-critical end-of-train (or length-of-train) determination, and a safety-critical train integrity function. By supplementing the train detection and integrity functions with information on system latencies, guard zones, processing delays and a determination of safe braking distance, the method and system provides safety-critical onboard positive train separation information. This information is transmitted to a control center and used to determine safe separation distance between trains.

The invention provides an anti-dropping positioning device for an attached type lifting scaffold and a working method thereof. The anti-dropping positioning device of the invention comprises a guide seat which is connected with a guide-rail sleeve; a guide rail is provided with cross bars which are arranged at interval, and the guide seat is provided with an anti-dropping positioning wheel which is in sliding mesh type transmission with the cross bars; a clutch device is arranged between the wheel body of the anti-dropping positioning wheel and the shaft seat of the anti-dropping positioning wheel. During the slowly rising and dropping of the scaffold, the sudden dropping of the scaffold can cause the anti-dropping positioning wheel to generate relatively high speed of reverse rotation, and an auto-trigger triggers the clutch device to work, which causes the anti-dropping positioning wheel to be incapable of having reverse rotation and to block the cross bars at interval arrangement on guide rails so as to prevent the scaffold from continuously dropping. While the dropping of the scaffold to a certain position, the clutch device is manually operated to prevent the anti-dropping positioning wheel from reverse rotation by blocking the cross bars on the guide rail so as to realize the positioning of the scaffold. The anti-dropping positioning device for an attached type lifting scaffold of the invention has the advantages of compact structure, short braking length, flexible operation, being difficult to be blocked and stopped, simple and easy installation and safe and reliable use.

The invention discloses a brake method capable of distinguishing the brake intention of a driver, comprising: an electric control unit receives information input by a brake pedal position sensor, an accelerator pedal position sensor and the like, then fuzzy reasoning algorithm is used for distinguishing the brake intention of the driver, finally, a corresponding brake intention control signal can be generated; the brake intention control signal can be used for controlling the action of an EHB executing mechanism, thus fully exerting the advantages of the EHB system, accurately reflecting the intention of the driver in time in case of emergency, reducing brake reaction time, shortening braking length and optimizing the stability of vehicle.

The invention provides a vehicle braking auxiliary device based on aerodynamics. The vehicle braking auxiliary device based on aerodynamics comprises an ECU (electronic control unit), at least two link mechanisms, a fixed shaft, a front spoiler, a rear spoiler, at least two step motors, at least three hydraulic cylinders, a vehicular speed sensor, a turning angle sensor, at least two position sensors and at least three pressure sensors. The vehicular speed sensor, the turning angle sensor, the position sensors and the pressure sensors are all connected with an input end of the ECU, each step motor and each hydraulic cylinder are connected with an output end of the ECU, one end of each link mechanism is correspondingly connected with an output shaft of one of the step motors while the other end of each link mechanism is in transmission connection with the rear side of the front spoiler, the front spoiler is capable of rotating around the fixed shaft which is arranged on the front side of the front spoiler, and a piston rod of each hydraulic cylinder is connected with the rear spoiler. The vehicle braking auxiliary device based on aerodynamics is capable of instantly reducing vehicular speed to some extent and increasing ground adhesion of a vehicle to enable the vehicle to keep stable in high-speed emergency braking, braking distance can be shortened, and safety is improved.

The invention provides a brake system and a brake processing method for a rail transit vehicle. The brake system for the rail transit vehicle comprises a brake instruction generating device, a brake control device and a brake executing device, wherein the brake instruction generating device is connected with the brake control device; and the brake control device is connected with the brake executing device and a sensor respectively. By the brake system and the brake processing method, the optimal braking force value for a brake action can be acquired according to the real-time state of a train and the brake action is performed by using the optimal braking force value, so the braking distance of the rail transit vehicle can be effectively shortened; wheels are prevented from sliding; the safety of train operation can be improved; a wheel tread can be effectively protected; and the service life of the wheels is prolonged.

The invention provides a running speed control method of a combined train. The method comprises following steps: A, the present distance between the train and an object is confirmed; B. the present safe braking distance between the train and the object is calculated; C, when the present distance between the train and the object is judged to be smaller than the safe stopping distance, a braking mode curve is generated to perform braking. By adopting the method, the speed of the combined train can be controlled in real time on a whole rail way, and the signaling security of the transportation of the train can be improved.