714results about How to "Smooth braking" patented technology

The invention relates to a method for improving lateral stability under the condition of turning/braking vehicles, in particular to an automobile brake control method for improving lateral stability of turning/braking vehicles. By an off-line simulation method, from the angle of whole-vehicle dynamics, based on optimization technology, the invention calibrates an optimal target slip-rate working interval of an automobile ABS system comprehensively considering both longitudinal braking performance and lateral braking performance under the turning/braking condition, forms a curved surface from target slip rate to steering angle to initial braking speed, and then supplies the target slip rate for dynamically adjusting wheels inside and outside a bend to an online ABS system. The online ABS system adjusts the pressure of a braking wheel cylinder to reasonably allocate longitudinal force and lateral force that every wheel bears when a vehicle turns/brakes so as to improve the lateral stability of the vehicle. On the basis of the prior ABS system, the method has the advantage of allowing the ABS system to have part of the functions of an ESP system without increasing any cost.

The invention provides an electromagnet and friction composite disc type brake and a brake method. Both a steering knuckle and a brake caliper bracket are fixedly connected with an electromagnet brake fixing device, and the electromagnet brake fixing device is fixedly connected with magnet cores. The magnet cores are symmetrically arranged on the two sides of a brake disc, and coil windings are wound on the magnet cores. Permanent magnet bodies and the magnet cores are oppositely arranged, and air gaps are arranged between the permanent magnet bodies and the magnet cores. When an automobile brakes, electromagnet fields distributed on the axes of the coil windings are generated after the coil windings are electrified, and the directions of the electromagnet fields generated by the coil windings on the two sides of the brake disc are consistent. The permanent magnet bodies rotate 90 DEG, the directions of the permanent magnet fields of the permanent magnet bodies are consistent with the directions of the electromagnet fields of the coil windings, and the brake disc is braked by the superposition of the electromagnet fields and the permanent magnet fields. The size of the brake force is adjusted by adjusting the different rotating angles of the permanent magnet bodies or the size of electrifying current in the coil windings. The action time of the brake is shortened, the brake efficiency is enhanced, the use strength of the friction brake is reduced, the abrasion of brake pads is alleviated, and the brake force is easy to control.

The invention provides a control method of a regeneration brake process of a front and back axle driving electric automobile. The control method is characterized in that firstly, whether the brake requirement exists or not is judged through detecting the opening degree of a brake pedal; then, whether the automobile speed, the battery pack SOC and the brake intensity meet the regeneration brake control starting conditions or not is judged; then, a regeneration brake torque distribution optimization model of a front and back axle driving motor is built; T<bf> and T
are obtained through solution. The control method provided by the invention has the advantages that the safety and the stability of the front and back axle driving electric automobile in the brake process can be ensured; meanwhile, the brake energy is recovered to the maximum degree; the running mileage of the electric automobile is further prolonged.

The invention relates to a carbon ceramic braking pad for a high-speed train and a preparation method of the carbon ceramic braking pad. The carbon ceramic braking pad is made of carbon ceramic composite material; the carbon ceramic composite material comprises the following components in percentage by mass: 16-30 percent of carbon fibers, 20-36 percent of pyrolytic carbon, 28-46 percent of silicon carbide, 6-12 percent of molybdenum disilicide and 2-6 percent of simple substance silicon; the density of the carbon ceramic composite material is 1.8-2.4g/cm<3>; the carbon fibers are uniformly distributed in the carbon ceramic composite material in a three-dimensional network structure. According to the invention, after the high-temperature heat treatment is performed on a carbon fiber felt with the density of 0.20-0.65g/cm<3>, the pyrolytic carbon is generated in the carbon fiber felt through the thermal-gradient chemical vapor deposition carburizing treatment, then the catalytic graphitization treatment, non-immersion type melting infiltration and assembly are performed, so that the carbon ceramic braking pad for the high-speed train is obtained.The carbon ceramic braking pad is simple in preparation technology, moderate in friction coefficient, good in abrasion performance, stable in braking and strong in environmental suitability and can meet braking requirements of the high-speed train with the speed of 200Km/h.

The invention relates to a DC motor control circuit, a braking method, an electricity generating method and a device thereof, in particular to the problems of the starting, the speed regulation, the braking and the reversal rotation of a series excitation DC motor. The control circuit comprises an excitation circuit (7), an armature circuit (8) and a DC voltage transforming circuit (9), and has the characteristics of reusing the braking energy and no mechanical contact point in reversal rotating control. The braking method reuses the braking energy, and the electricity generating method utilizes the rotation of the series excitation DC motor to generate electricity. The device of the invention realizes the stable starting, the stepless speed control, the stepless braking and the running of reversal rotation, the energy in braking is fed back or reused, and the energy in braking can be effectively controlled if the series excitation DC motor rotates when the electricity is cut off. No input electric source exists. If the series excitation DC motor continuously rotates under the action of external force, the device is an electricity generator of the series excitation DC motor and can provide an electric source for the outside.

The invention provides a pure electric two-speed transmission. The pure electric two-speed transmission comprises an input shaft (1), a reducer (6), an output shaft (7) and a brake (8), and a planetary mechanism which comprises a sun gear (4), a planet gear (3), a gear ring (5) and a planet carrier (2), wherein the planet carrier (2) is fixedly assembled to the input shaft (1), the sun gear (4) is fixedly assembled to the output shaft (7), and the right end of the output shaft (7) is fixedly connected with the reducer (6), the pure electric two-speed transmission is characterized by further comprising a one-way clutch (9), the right end of the output shaft (1) is connected with the left end of the output shaft (7) through the one-way clutch (9), and the gear ring (5) of the planetary mechanism is connected with the brake (8). According to the invention, gears can be shifted only by using one one-way clutch 9 and one brake 8, and one one-way clutch 9 and one brake 8 are only required to be controlled when the gears are shifted, so that the control difficulty is smaller.

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.

This invention discloses a hydraulic disk integrated arrester based on a screw driven floating clamp composed of a pull arm component, a mandril component, a steel ball component, a push rod, a piston, a friction block, a caliper and a brake disk connected orderly, in which a clamp floating bracket is connected with the clamp by a guiding bolt, an installation bracket is connected with the floating bracket and fixed on a car bridge by bolts, which applies a special three-lockless screw structure to realize calm transfer of brake force and adjusts the working gap between a friction block and a brake disk automatically.

The invention relates to a cross-country friction material composition for air discs, and the cross-country friction material composition for air discs is characterized by being composed of the following raw materials in parts by weight: 20-52 parts of reinforced fibers, 4-16 parts of an adhesive and 23-86 parts of a friction performance modifier. The cross-country friction material composition for air discs is prepared by the steps of weighing the reinforced fiber, the adhesive and the friction performance modifier by weight to prepare a molding compound, paving a base-layer material formed by weighed fiber material and adhesive on a mold, paving weighed friction material on the base layer to carry out thermocompression, and finally carrying out thermosetting. The cross-country friction material composition for air discs is used for the air disc brakes in complicated road conditions, particularly the cold highland area and wading road conditions, so that a friction material which has good heat recession resistance, high wading restoration performance, temperature alternation repeated impact resistance and stable friction performance is provided.

The invention provides a tire blowout braking control system, belonging to the field of automobile safety technique. The invention solves the problems of ruder and crueler braking action and stability deficiency of the existing automobile tire blowout braking system of. The tire blowout braking control system provided by the invention comprises a control device and a tire pressure monitoring unit for detecting the tire blowout state, wherein the control device is connected with an engine control unit and the tire pressure monitoring unit; and the control device can control the tire braking and reduces the engine torque through the engine control unit when the tire blowout signal fed back by the tire pressure monitoring unit is received. The invention has the advantages that when the tire blowout braking control system inducts the occurrence of tire blowout, on one hand, the emergent braking is carried out, on the other hand, the engine torque is reduced, thereby reducing the speed of the automobile; and the two hands are simultaneously carried out, thus the tire blowout braking course is milder and the stability is higher.

A copper-free high-performance environment-friendly type friction material for a saloon car and a preparation method thereof are provided. The friction material comprises the following components in parts by weight: 6-8 parts of phenolic resin, 2-4 parts of aramid fiber, 13-18 parts of an RB205 mixture, 15-20 parts of potassium titanate, 5-8 parts of calcium hydroxide, 20-25 parts of barium sulfate, 1-3 parts of artificial graphite, 3-5 parts of a cashew nut oil friction powder, 3-5 parts of antimony sulfide, 1-3 parts of a butyronityile rubber powder, 3-5 parts of mica, 4-6 parts of calcium silicate, and 1-3 parts of zirconia. The preparation method comprises the steps: a) weighing the component materials according to the formula ratio, and then dispersing into a uniform mixture; b) loading the mixture into a saloon car friction block dedicated die, carrying out hot press molding with the hot press duration time of not less than 5 minutes; and c) carrying out conventional heat treatment on the friction material after hot press molding, and after being fully cured, carrying out size and appearance machining into the product. The friction material has the advantages of excellent high-temperature characteristic, good abrasive resistance performance, good braking performance, reasonable price, recession resistance, high life, stable friction coefficient and the like.

The invention relates to an energy-consumption braking control module of a three-phase asynchronous motor, comprising a power supply unit, a single chip control unit and a braking direct-current voltage output unit, wherein direct-current voltage output by the braking direct-current voltage output unit is transmitted to a two-phase stator winding of a motor when the motor stops so as to generate braking torque. The energy-consumption braking control module of a three-phase asynchronous motor is characterized in that the single chip control unit detects the work state of the motor by the work conduction angle of the voltage output unit, and a preset program controls the size of the conduction angle so as to regulate the output time and magnitude of the direct-current voltage required by braking. The energy-consumption braking control module of a three-phase asynchronous motor also comprises a zero cross signal detection unit, a running state detection unit, a winding temperature detection unit and a braking current detection unit, wherein each unit respectively outputs a corresponding signal transmitted to the single chip control unit for processing. The invention adopts integrated IC, has little used elements, compact structure, independent products and convenient installation and use and is beneficial to popularization and application; and the single chip is flexible to control, the intellectualized degree is high, and the braking of the motor is safe and stable.

A brake fill effect minimization function for preventing or reducing brake controller windup during a brake fill condition or the like that may commonly occur in hydraulic or electromechanical brake systems, particularly during initial application of the brakes or during anti-skid conditions. The function temporarily reduces error input to the brake controller during a perceived brake fill condition (hydraulic brakes) or running clearance condition (electromechanical brakes) thereby facilitating smooth application of the brakes during initial braking and/or under anti-skid conditions.

The embodiment of the invention provides an air braking system and a control method of the air braking system. The air braking system comprises a redundancy channel, a distribution valve and a braking vitrified clay pipe, wherein one end of the redundancy channel is connected with a main blast line and the other end of the redundancy channel is connected with the braking vitrified clay pipe; when a railway locomotive is emergently braked, the redundancy channel receives main blasts in the main blast line; when the air pressure of the main blasts received by the redundancy channel is higher than the air pressure of compressed air in the braking vitrified clay pipe for a preset threshold value, the redundancy channel conveys the received main blasts into the braking vitrified clay pipe, and the air pressure in the braking vitrified clay pipe is increased. The distribution valve is connected with a control vitrified clay pipe and used for inflating the braking vitrified clay pipe with the compressed air, so that the air pressure in the braking vitrified clay pipe is increased. When the value of the air pressure in the braking vitrified clay pipe is not smaller than a preset numerical value, the railway locomotive is braked.

The invention discloses an automobile kinetic energy conversion and recovery device. The automobile kinetic energy conversion and recovery device is used for storing energy during subway braking and recovering kinetic energy during starting. The automobile kinetic energy conversion and recovery device mainly comprises an eccentric wheel, hydraulic plungers and a corresponding hydraulic loop. During subway braking, the eccentric wheel and an axle rotate synchronously, so that the built-in hydraulic plungers conducts reciprocating radial motion; hydraulic oil is pressed into an energy accumulator through the hydraulic plungers on the basis of the design of the corresponding hydraulic loop, and therefore kinetic energy of the automobile is converted into hydraulic energy to be stored. During subway starting, the device is used as a low-speed large-torque hydraulic motor on the basis of switching control over an electromagnetic valve to push a subway to achieve kinetic energy recovery. According to the automobile kinetic energy conversion and recovery device, the hydraulic mode is utilized for energy storage, braking energy is not converted into electric energy and is just stored as hydraulic energy, and the efficiency is much higher than that of the existing energy storage mode.

The invention provides a magnetic-control brake, which is applied to a vehicle. The magnetic-control brake comprises a metal brake disc, wherein through holes are uniformly and circumferentially distributed on the brake disc; soft magnets are arranged in the through holes; insulators are arranged outside the soft magnets and inside the through holes for insulation; and a pair of coils is respectively arranged on two sides of circumferences of the through holes and generates a magnetic field orthogonal to the brake disc during energization. The magnetic-control brake provided by the invention has the advantages of stableness, no vibration, brake noise and friction loss, and longer service life.