922results about How to "Shorter braking distance" patented technology

A brake system for a vehicle can be operated without a driver. It has a service brake device, a parking brake device and an emergency braking device. At least the wheel brake devices of the wheels of one axle of the vehicle have emergency brake actuators which switchover the assigned wheel brake devices into the braking state as a result of the triggering of an emergency braking operation. The emergency braking operation can be triggered either manually by means of an emergency operator control device or automatically by means of a monitoring device if the latter has detected an unacceptable operating state of the vehicle in the driverless operating mode.

A collision between a vehicle and an obstacle is estimated, and based on the estimation result, vehicle deceleration control is performed by a brake actuator to reduce the collision and vehicle wheel load is controlled by a suspension actuator.

The invention relates to an urban tram braking system. The system comprises a braking instruction generation system, a braking control system and an anti-skid system, wherein the braking instruction generation system comprises a braking electronic control unit (BECU) and a braking control unit (BCU) and sends a braking instruction to the BECU; the BECU calculates required braking force according to the braking instruction and loading force detected by a loading pressure sensor and provides the braking force for a traction control unit; the traction control unit feeds a dynamic braking force signal back to the BECU; the BECU calculates air braking force which is needed to be supplemented and controls the BCU to generate braking cylinder pressure so as to realize braking control; the braking instruction generation system is provided with a driver controller, an emergency braking switch and a logic control unit connected with the emergency braking switch; the anti-skid system comprises a speed sensor arranged on a wheel axle and an anti-skid exhaust valve arranged on a braking cylinder pipe; the speed sensor detects a speed signal and transmits the speed signal to the BECU; and the BECU controls the action of the anti-skid exhaust valve according to the speed signal.

The invention provides a skid-proof pin including a solid construction and an automobile equipped with the skid-proof pin; the skid-proof pin is embedded into a pin hole (9) cast on a tire surface of automobile tires. The skid-proof pin (1) comprises: a main body (5) which is made of a first material and comprises a soleplate (3) and a bar portion (4); and a hard metal ceramic member (2) which is made of a second material and is present in the main body. Section shape of the hard metal ceramic member is an irregular hexagon comprising in a direction perpendicular to length (L<N>) of the pin; a first pair of long sides (21, 23) and a second pair of long sides (22, 24) opposite to the first pair of long sides, and internal angles (K1 and K2) which unfold towards each other between said two pairs of sides; the internal angles (Ka and K2) are not less than 130 degrees and not more than 170 degrees; and two short sides (25, 26), between which a longitudinal distance is present which is larger than a transverse distance (W<W>) between peaks of two pairs of long sides.

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 discloses an automobile brake disc which comprises a brake disc body. The brake disc body is made of aluminum alloy. The two work faces of the aluminum alloy brake disc body are each provided with an abrasion-resistant layer in a composite mode. The abrasion-resistant layers are made of a ceramic reinforcing material. The abrasion-resistant layers made of the ceramic reinforcing material are metallurgically combined with the aluminum alloy brake disc body through the squeeze casting technology. The brake disc is low in weight, good in abrasion resistance and cooling performance, long in service life, low in maintenance cost, and capable of reducing automobile oil consumption, improving the passage capacity of an automobile, shortening the brake distance and improving safety of the automobile. According to a manufacturing method of the brake disc, by means of selective local strengthening and the squeeze casting technology, the two work faces of the aluminum alloy brake disc body are each provided with one abrasion-resistant layer made of the ceramic reinforcing material in the composite mode, the abrasion-resistant layers made of the ceramic reinforcing material are metallurgically combined with the aluminum alloy brake disc body so that abrasion resistance of the work faces of the brake disc can be guaranteed, and raw material cost and machining cost of the brake disc are reduced.

The invention discloses a test jack horse and a test method of electric vehicle electromagnetic and frictional brake integrated system; a vehicle type brake disc to be tested and an electromagnetic brake iron core wound with electromagnetic brake coil are arranged in the middle part of a test tire transmission shaft; a brake pincher is installed close to the brake disc, and is connected with a hydraulic oil path device; one end of a load wheel transmission shaft is tightly connected with a load tire and the other end thereof is connected with a rotary flywheel; the test tire is installed on the test tire transmission shaft and is contacted with the load tire; a driving motor is started to drive the test tire to rotate; the hydraulic oil path device is connected to exert a frictional brake force to the brake disc; and an oil pressure sensor transmits the detected oil pressure and the tire rotating speed signal detected by a wheel speed sensor to a control unit or a PC computer so as to control the electrification current of the electromagnetic brake coil. The invention can research the distribution relation of the brake moments of the electromagnetic brake and the frictional brake and the influence factor of the brake moment of the electromagnetic brake, and obtains the optimal structural parameters of electromagnetic brakes in different vehicle types.

Action force of a wheel is measured in order to measure the road surface frictional force, vertical drag, road surface friction coefficient, etc. Means for making these measurements can be constituents of an antilock brake system, traction control system, etc. These constituents may also serve as devices for measuring stresses generated in other structures. In a specific example, axle of a vehicle is formed with a hole, a stress detection sensor is installed in the hole and secured in position with the aid of a spacer element, and a detection signal from the stress detection sensor is processed in a signal processing circuit.

The invention discloses a collision avoidance system and an automatic braking method of an electric automobile. The collision avoidance system comprises an information collecting module, an information processing module, an intelligent decision making module, a regenerative braking module and a mechanical braking module, wherein the information collecting module is used for real-timely collecting the distance between the electric automobile and a front vehicle or an obstacle and a current running speed; the information processing module is used for real-timely calculating rear-end time of the electric automobile and the front vehicle or the obstacle, regenerative braking safe time and mechanical braking safe time; the intelligent decision making module is used for deciding whether normal running is continuously kept or whether a regenerative braking mode is started or whether a combined braking mode of the regenerative braking mode and a mechanical braking mode is started according to the rear-end time of the electric automobile and the front vehicle or the obstacle, the regenerative braking safe time and the mechanical braking safe time; the regenerative braking module is used for starting regenerative braking for the electric automobile according to a regenerative braking mode starting signal provided by the intelligent decision making module; and the mechanical braking module starts mechanical braking for the electric automobile according to a combined braking mode starting signal provided by the intelligent decision making module.

The invention discloses a self-adaptive autonomous emergency brake (AEB) control algorithm based on road adhesion. The self-adaptive autonomous emergency brake control algorithm based on the road adhesion predicates collision risk between a vehicle and a forward obstacle though obtaining forward obstacle information, information of the vehicle and a road adhesion coefficient and makes a final pre-warning and autonomous braking decision by taking control input of a driver into consideration so as to remind the driver of adopting forward collision avoidance control or avoid collision between the vehicle and the forward obstacle or reduce collision degree between the vehicle and the forward obstacle by using autonomous braking interference if necessary. According to the self-adaptive autonomous emergency brake control algorithm based on the road adhesion, on the premise of not changing the configuration of the existing vehicle-mounted sensor, the road adhesion coefficient is estimated in real time; the pre-warning and autonomous braking opportunity can be automatically adjusted in a safe distance model according to the road adhesion coefficient so that the forward collision avoidance safety on road surfaces with various road adhesion coefficients is ensured and false alarm or false brake interference is avoided; driving safety and good driving experience are both achieved; and during driver brake interference, the self-adaptive autonomous emergency brake control algorithm based on the road adhesion can apply necessary brake assistance according to the calculated collision risk.

The invention discloses a vehicle auxiliary braking control method which comprises the steps that an accelerator pedal signal and a brake pedal signal of a vehicle are obtained; the state of an accelerator pedal and the state of a brake pedal are judged according to the accelerator pedal signal and the brake pedal signal; if the accelerator pedal is in a loose state and the brake pedal is in a depressing state, the current speed is further detected for the vehicle; if the current speed of the vehicle is larger than a preset speed, the opening size of an exhaust valve of a vehicle engine is adjusted, so that auxiliary braking is conducted on the vehicle through the engine. According to the embodiment of the vehicle auxiliary braking control method, frequent use of a brake disc for braking can be reduced, the safety of the vehicle in driving is improved, and the service life of the brake is effectively prolonged. The invention further discloses a vehicle auxiliary braking control system and a vehicle including the same.

The present invention relates to a fall protection device used in the process of climbing steel tower of power transmission line. Said full protection device includes the following several portions: large hanger, small hanger, endless rope, delta wire-lock fastener, pear-shaped fastener, small tackle and safety hook. Said invention also provides a fall protection method by using said fall protection device and its concrete operation steps.

The invention discloses a road dust suppressant, and preparation and construction methods thereof, and belongs to the field of environmental protection and dust suppression. The road dust suppressant consists of the following components in percentage by weight: 0.1-2 percent of dispersible emulsion powder, 0.1-10 percent of an emulsion, 0.2-5 percent of a hygroscopic moisturizer, 0.01-0.5 percent of an absorbent, 2-10 percent of an anti-freezing agent, 0.1-0.2 percent of a wetting agent, 1-25 percent of filler and the balance of water. The road dust suppressant, and preparation and construction methods thereof disclosed by the invention have the benefits that inhalable particulate matters, nitric oxide, sulfide and other harmful matters on roads can be effectively reduced; the road dust suppressant has the characteristics that the environment is friendly, the hygroscopicity and the moisture retention are strong, the corrosion to vehicles and the roads is weak, and the road potential safety hazards cannot be caused.

The invention relates to an automobile brake device and a braking method thereof, in particular to an automobile auxiliary brake-powered speed-reduction friction device and a braking method thereof. The automobile auxiliary brake-powered friction device comprises an automobile chassis longitudinal beam, wherein the lower part of the automobile chassis longitudinal beam is provided with a friction brake pedal; a friction plate is arranged below the friction brake pedal; and a transmission mechanism which is connected with a control circuit is also arranged between the automobile chassis longitudinal beam and the friction brake pedal. The device and the method can increase a braking force effectively by using the friction force generated by friction between the friction brake pedal and the ground when an automobile is braked in emergency or runs down a slope continuously, so that the braking distance in emergent brake is reduced or traffic safe accidents caused by the braking failure of a drum brake at an overhigh temperature when the automobile runs down the slope continuously.

Disclosed is an automatic control system and method for keeping a car at a safe distance in traffic from an obstacle or other car. The inventive automatic control system comprises: a sensing device 100 for sensing a car or an obstacle in front of the system-installed car in the traveling direction; an electronic control unit (ECU) 200 connected to the sensing device 100 and receiving electric signals transmitted from the sensing device 100 as a result of sensing a car or an obstacle so as to render a control command according to a preset program; an accelerator unit 310 for automatically controlling the deceleration of the system-installed car on the basis of the electric signal from the ECU 200; a first guide stop unit 315 which operates independently of the accelerator unit 310 and controls the vertical movement of an accelerator pedal 400; a brake unit 330 for automatically controlling the braking of the system-installed car on the basis of the electric signal from the ECU 200; and a second guide stop unit 350 which operates independently of the brake unit 330 and controls the operation of a brake pedal 400′.

The invention relates to an aluminum alloy brake disc, and in particular relates to a carbon fiber reinforced aluminum base composite material for the brake disc and a preparation method of the composite material. The carbon fiber reinforced aluminum base composite material for the brake disc is prepared by taking an aluminum-silicon-copper series aluminum alloy as a matrix and micro-nano scale carbon fibers as a reinforcing phase of the aluminum alloy matrix, and performing melt synthesis-compression molding. Compared with the prior art, through carbon fiber reinforcement, the fatigue resistance and wear resistance of the material are improved, and the material is good in braking effect and long in service life and can be applied to brake discs of various motor vehicles.

The invention relates to a method and system for braking a railway vehicle, which have the advantages of higher brake force, shorter idling braking time and brake cylinder boosting and relieving time and capabilities of shortening the braking distance, arranging passenger trains and adjusting the brake force according to the change of the weight of the vehicle. A high-friction-coefficient composition brake shoe with a higher friction coefficient is adopted, and the pressures of the brake cylinder and the brake shoe are controlled on the basis of measurement of the vehicle load by using a sensing valve, so that stepless control of the brake force of a quick freight car is realized; and the idling braking time and the brake cylinder relieving time are shortened by changing the inflation anddeflation time of the brake cylinder. The invention provides a method and system for braking a quick railway freight car. By adopting the method and system, the stepless change of the brake force canbe realized with the load increase and decrease change of the vehicle at the same time of improving the brake force and shortening the idling breaking time, therefore the safety traveling braking distance is ensured; meanwhile, the device has the advantages of high reliability, high vibration insulation, high dynamic performance, higher linearity and high sensitivity.

The invention provides a braking control method of a vehicle. The vehicle comprises a motor and a mechanical braking mechanism. The method comprises the following steps of outputting the motor braking torque by the motor to brake the vehicle; in the process of braking, obtaining a wheel slip rate according to a speed signal and a wheel rotation speed signal; judging whether the wheel slip rate is within a preset range; if the wheel slip rate is not within the preset range, further judging whether the wheel slip rate is less than the lower limit of the preset range; if the wheel slip rate is less than the lower limit of the preset range, judging whether to increase the motor braking torque or combine with the mechanical braking mechanism to brake the vehicle to shorten the braking distance of the vehicle according to the motor braking torque and expected braking torque. By applying the method, the braking distance can be shortened to the maximum, and locking and slipping of wheels are avoided, so that the braking safety of the vehicle is improved. The invention also provides a braking control system of the vehicle.

The invention provides an elastic high-speed brake lining, consisting of a steel backing (1), a brake block (2), a dovetail plate (3), a gasket (4), a disk spring (5), a guide sleeve (6), a bushing (7) and a rivet (8). The elastic structure high-speed brake lining provided by the invention has the advantages of high mechanical strength, small wearing capacity, stable friction performance, good thermal stability, good heat conductive performance, high dynamic moment and static moment, no noise, seawater corrosion resistance, sand wind prevention, excellent salt mist resistance and the like. Due to the elastic structure, the brake block of the high-speed brake lining is protected from eccentric wear caused by insufficient contact of the brake block of the high-speed brake lining and the surface of a brake disc, so that a high-speed train can brake smoothly, and the braking distance is short.

The invention relates to a control method of a vehicle manual control accelerator with a cruise function and a system thereof. The method comprises a manual control accelerator control method, a manual control cruise control method and a foot accelerator control method, wherein the foot accelerator control method is to maintain the original foot accelerator control system; the manual control accelerator control method is to additionally arrange a manual control accelerator control system which can be individually controlled at the same time; and the manual control cruise control method is to additionally arrange a cruise control system at the same time. The system comprises a manual control accelerator system, a manual control cruise system, a foot accelerator system, a foot control brake system, and a co-control system of the foot control brake system, the manual accelerator system and the manual control cruise system.

The invention discloses an antiskid braking control system for an airplane. A left braking instruction sensor, a right braking instruction sensor, a left wheel speed sensor, a right wheel speed sensor, a cabin operation information port and a charcoal / charcoal (C / C) information storage unit are connected with an antiskid braking controller; and the antiskid braking controller controls a left mainmachine wheel and a right main machine wheel through a left electrohydraulic pressure servo valve and a right electrohydraulic pressure servo valve respectively. The antiskid braking control system for the airplane can effectively prevent the moment of a charcoal tray from reaching the peak, automatically regulates braking pressure, and powerfully ensures that the braking process is stable and safe.

The present invention is provided with electric motors (1 and 4) for driving or braking drive wheels (3 and 6), wheel speed detectors (9 to 12) for detecting the wheel speed of the drive wheels and the driven wheels (7 and 8) in an electric drive vehicle provided with an electric motor controller (33) for controlling the electric motors, computing means (22 to 28, 35 to 38) for computing the slip ratio of the drive wheels on the basis of the wheel speeds of the drive wheels and the driven wheels, and a determiner (29) for determining that drive wheels are slipping if the slip ratio exceeds a slip ratio assessment value. At the determiner (29), when the wheel speed of the driven wheels is lower than a set speed (Va2 or Vb2), the slip ratio determination value is modified to the value having the same sign as, and a greater absolute value than, the value (?a2 or ?b2) used when the wheel speed of the driven wheels is greater than the set speed (Va2 or Vb2). As a result, the acceleration time when the vehicle is accelerating and the braking distance when the vehicle is decelerating are shortened and vibration of the electric drive vehicle is suppressed.

The invention discloses an environmental-protection high-speed car brake sheet and a warm-pressing process of the brake sheet. A frictional material of the environmental-protection high-speed car brake sheet comprises the following components in parts by weight: 6-8 parts of phenolic resins, 2 parts of acrylonitrile rubber powder, 1-3 parts of Kevlar fibers, 5-7 parts of stannic sulfide, 5-7 parts of artificial graphite, 2 parts of polytetrafluoroethylene, 18-20 parts of steel fibers, 4-6 parts of red copper fibers, 2 parts of aluminum oxide, 3-5 parts of zirconium silicate, 5-7 parts of iron oxide black, 7-9 parts of titanium white, 6-8 parts of mineral fibers, 7-9 parts of white vermiculite, 8-10 parts of grammite and 5-9 parts of barium sulfate. The warm-pressing process of the environmental-protection high-speed car brake sheet comprises the steps of material burdening, material mixing, warm-pressing formation, thermal treatment, grinding and spraying. The high-speed car brake sheet has the advantages of safe and comfortable brake, no noise, low high-temperature and high-speed recession, stable frictional factor, environmental protection, long service life and the like; and the warm-pressing process of the environmental-protection high-speed car brake sheet has the advantages of high rate of finished products, high mechanical degree, high production efficiency and low energy consumption.

The invention discloses a train anti-skid control method based on an optimal slip rate and a control device thereof. The method comprises the following steps: firstly, according to a braking cylinderpressure, calculating a locomotive braking force; secondly, according to a non-linear relationship between an adhesion coefficient and a slip rate, calculating the optimal slip rate through an extremevalue search algorithm; and according to a difference value of an actual slip rate and the optimal slip rate, through running a PID control algorithm, solving to obtain a braking force moment by an anti-skid valve control panel; based on the braking force moment, controlling an anti-skid valve switch to exhaust air or re-charge air to the braking cylinder, adjusting the pressure of the braking cylinder until the braking force moment is solved. The anti-skid control method is capable of realizing the optimal slip rate as a control objective, through adjusting parameters of a controller, enabling a wheel slip rate to be near the optimal slip rate, and guaranteeing that a train has the good anti-skid control effect while driven in different rail environments.

The invention discloses a dual-motor drive-by-wire pressure sequence adjusting brake system. Two motors are used for driving a ball screw assembly to push two high pressure cavities of a brake master cylinder to internally generate brake pressure. The system is provided with only four electromagnetic valves. The electromagnetic valves are arranged in pairs to be communicated with the two high pressure cavities of the brake master cylinder respectively, and therefore wheel cylinder pressure is adjusted. For brake wheel cylinders needing pressure decreasing or increasing, the normally open electromagnetic valves connected with brake wheel cylinders not needing pressure decreasing or increasing are closed. A motor control unit is used for controlling a second motor to rotate in reverse direction or forward direction. When the pressure of the brake wheel cylinders needing pressure decreasing or increasing is decreased or increased to a preset value, the normally open electromagnetic valves connected with the brake wheel cylinders needing pressure decreasing or increasing are closed, and brake wheel cylinder pressure decreasing or increasing is achieved. The dual-motor drive-by-wire pressure sequence adjusting brake system has the advantages that various functions such as ABS, TCS and ESP are integrated, a traditional ABS pressure adjusting unit is simplified, and the wheel cylinder pressure can be adjusted only through the four electromagnetic valves.

An apparatus for preventing a vehicle collision by using radio communication includes an accelerator pedal sensor for detecting the manipulation state of an accelerator pedal. A control unit receives a signal detected by the accelerator pedal sensor and determines whether the vehicle is in a dangerous condition for outputting a relevant control signal. A radio communication transmitting / receiving module receives the control signal from the control unit and transmits or receives the information to or from vehicles of its dangerous condition. A Hydraulic Control Unit (HCU) receives the control signal of the control unit and maintains the brake system in a standby operating mode. When the information of a prospective hazardous condition is transmitted from the front vehicle, the brake systems of rear vehicles are pre-pressured and are shifted to a standby operating mode, thereby reducing the braking distance of the vehicles and preventing vehicle accidents.

The invention provides a device capable of adjusting vertical loads of four wheels of an automobile. The device comprises a front left wing plate, a front right wing plate, a rear left wing plate, a rear right wing plate, a wing plate posture adjusting mechanism and an automobile-mounted ECU. The front left wing plate and the front right wing plate are arranged on the front portion of an automobile body and located in front of front wheels on the lower end face of a chassis, the front left wing plate is adjacent to the left front wheel, and the front right wing plate is adjacent to the right front wheel. The rear left wing plate and the rear right wing plate are arranged on the left side and the right side of the rear portion of the automobile body. The wing plate posture adjusting mechanism is connected with the front left wing plate and the front right wing plate so as to adjust the attack angles of the front left wing plate and the front right wing plate. The automobile-mounted ECUis connected with the wing plate posture adjusting mechanism. The wing plate posture adjusting mechanism is connected with the rear left wing plate and the rear right wing plate so as to adjust the attack angles and the position height of the rear left wing plate and the rear right wing plate. When the automobile travels, the front left wing plate, the front right wing plate, the rear left wing plate and the rear right wing plate convert airflow force born by the wing plates into pressure and / or resistance applied to the automobile body; and aerodynamic force can be used for applying pressureor resistance to the automobile in the automobile traveling process so as to enhance the controllability of the automobile.

The invention belongs to the technical field of operating maintenance of power transmission lines, and particularly relates to an anti-falling device for steel pipe pole operation of power transmission lines. The anti-falling device is arranged on a binding type safety belt base body, a steel pipe pole on the safety belt base body is carried by a worker to an operation position, a locked detectiondevice is unlocked and winds across angle iron so as to be tied, and a hanging ring of a falling brake device is hung at a high position. A warning message can be given out if a safety belt is not tied, and an insertion head can be pushed inwards automatically if the insertion head is not fastened. When the worker falls, a central control monitoring unit can provide a brake signal to make the falling brake device to act rapidly, mechanical brake is triggered if an electric fault happens, and thus dual protection is achieved. The work conditions of all components are fed back to ground monitoring personnel in the whole process. The anti-falling device has the advantages that the brake distance is short, noise is avoided in the operation process, reminding and monitoring functions can be achieved, and the anti-falling device is safe and reliable.

The invention relates to an integrated double-main-cylinder line control braking system. The system comprises an ECU electronic control unit, an electronic pedal, a pedal displacement sensor, a first braking passage, a second braking passage and a braking liquid loop. Double-main-cylinder design is adopted in the system, an assisting main cylinder, namely the second main cylinder is additionally arranged, pressure is applied through a motor and a lead screw instead of a plunger pump and an energy accumulator originally, a working cavity and a liquid supplementing cavity of the second main cylinder can be switched freely, the motor does not need to rotate forwards and reversely frequently, the service life of the motor is prolonged, and braking response time is shortened. Meanwhile, multiple braking manners can be provided through the system, especially in the micro-braking process, the assisting main cylinder does not work, a conventional main cylinder applies pressure, the working time of the motor is shortened, and the service life of the motor is prolonged.