413results about How to "Improve braking efficiency" patented technology

The invention provides a method for braking a high-speed train, a system for braking the high-speed train, and a brake control device. The method for braking the high-speed train comprises the steps of: receiving a train braking instruction, and acquiring real-time state information of a braking unit; determining target brake force according to the braking instruction and the real-time state information; acquiring the actual electric braking force provided by the braking unit; and determining the air braking force exerted by braking equipment according to the target braking force and the actual electric braking force. According to the method for braking the high-speed train, the system for braking the high-speed train and the brake control device, the braking force can be determined according to the real-time sate of the braking unit of the train; the braking force can be reasonably distributed according to the actual conditions of an electric braking device and an air braking device, thus, the braking distance of the high-speed train can be effectively controlled; the braking efficiency can be improved; and the energy can be effectively saved.

The invention provides a copper based powder metallurgy high speed brake lining, which comprises a steel backing, a brake block, a framework, a spring washer and a swollen tail block. In the course of braking, the brake lining has smaller abrasion loss and can effectively prevent the edge dropping, angle dropping and camber wear of the brake block. The brake block uses copper based powder metallurgy friction material; copper powder, iron powder, tin powder, chromium powder, titanium powder, nickel powder, bismuth meal, graphite, boron nitride, aluminum oxide, silicon dioxide, zirconite and the like are well blended according to the proportion, stamped and sintered on the framework after cold pressing. The copper based powder metallurgy high speed brake lining has the characteristics of high mechanical strength, good thermal conduction, good thermal stability, strong heat-resistant fade performance, long service life, small abrasion on a retarding disc and stable friction performance and the like, and can effectively control very high way trains with 200-300km / h per hour.

A boosting system for the braking of electric car or the car with mixed power system is composed of the push rod of pedal, reactive rubber disc, the push rod of master cylinder, braking pedal, casing, electric motor, worm-gear set, nut, spring, piston, restoring springs, baffle ring and bearings.

A regenerating braking system is provided, which includes: a synchronous motor with field coil excitation including a cylindrical stator coil, an inverter electrically connected to the stator coil, a battery electrically connected to the inverter, a rotor coil provided in an internal space of the stator coil, a two-way switch electrically connected to the rotor coil, and a capacitor electrically connected to the two-way switch; and a controller, wherein when the first differential calculus of acceleration of a load on the synchronous motor becomes negative, the controller stores regenerative power regenerated in the rotor coil from the stator coil, in the capacitor through the two-way switch, and wherein the controller supplies the regenerative power stored in the capacitor to the rotor coil through the two-way switch.

Disclose is a control system of an E-4WD hybrid electric vehicle that includes a first controller that controls a first driving portion disposed on a front axle and a second driving portion disposed on a rear axle. A second controller is connected to the first controller and configured to maintain a predetermined target speed. A third controller controls a braking torque through the first controller and the fourth controller detects / monitors conditions in front of the vehicle and performs deceleration through the third controller. A fifth controller controls the driving torque of a motor system. In particular, the first controller distributes driving torque for realizing a target deceleration / acceleration value based on the deceleration / acceleration information of the second controller and the fourth controller to the first driving portion and the second driving portion to control a driving torque and a regenerative braking torque thereof.

An aircraft engine assembly including a turbojet, a turbojet attachment pylon, and a nacelle mounted on the attachment pylon and surrounding the turbojet. The nacelle includes at least one mobile nacelle portion forming a single piece envelope all around a section of the turbojet, this mobile nacelle portion being mounted free to slide on the attachment pylon so that it can be moved from the forward position in the aft direction, and vice versa.

The invention discloses a long-downgrade self-adaptive retarder for a passenger vehicle and a control device and method thereof. The method comprises the steps that 1, current driving road informationof the passenger vehicle is detected; 2, a downgrade gradient, and a self-vehicle gear and a current vehicle speed of the passenger vehicle are detected, and the safe and stable speed and the safetyspeed of each level of the passenger vehicle under the current gear are obtained; 3, a corresponding braking mode is determined, and the retarder is controlled to automatically turned on and a corresponding retarder gear is selected; 4, after the retarder is turned on, a retarder excitation current is adjusted to realize accurate braking torque compensation of the retarder; and 5, the vehicle speed of the passenger vehicle is continuously detected in the braking process, and if the vehicle speed is less than or equal to the safe and stable speed of the passenger vehicle at the current gear andthe gradient, the retarder is turned off. The long-downgrade self-adaptive retarder for the passenger vehicle and the control device and method thereof realize the accurate braking torque compensation of the retarder, complete the deceleration process with higher braking efficiency, and ensure that the passenger vehicle can safely and effectively complete the braking and deceleration downgrade.

The brake dust cover structure of a vehicle prevents nearby components from being thermally damaged by insulating the brake disk from heat radiation and prevents impurities, such as pieces of stone, soil or the like, from entering into the brake disk along with air, thus preventing damage to the brake disk. The present invention further improves the cooling efficiency of the brake disk by maximizing the amount of airflow into the brake disk.

A method minimizes a driveline vibration and reduces stopping distances in a hybrid electric vehicle (HEV) having a plurality of drive wheels, a friction braking system having antilock braking system (ABS) capability, and an electronically variable transmission (EVT) with two EVT modes. The method automatically shifts the EVT to a predetermined high speed / low torque EVT mode when the ABS is active and when a calibrated maximum deceleration rate is not exceeded. An HEV has a friction braking system with ABS capability and an EVT including a plurality of modes. A controller automatically activates the friction braking ABS in response to a threshold level of slip between the drive wheels and the road surface when the brake pedal is actuated. An algorithm automatically shifts the EVT into one of the high speed / low torque EVT modes when the ABS is activated and the calibrated maximum deceleration rate is not exceeded.

The regenerative braking method and system for an electric vehicle in which regeneration current is calculated and controlled using control of an air conditioning system to consume a portion or all of the surplus regeneration power, thereby enhancing braking performance and feel. Control includes calculation of a regeneration current and comparison of the regeneration current to battery current to calculate the surplus regeneration power.

The invention comprises a pressure arm unit, a rotation shaft unit, a return spring, a push pedal, an internal friction plate, a brake, an external friction plate, a support and a caliper body arranged in order from right to left. Because of using the rectangular section torsional spring function, in a specific environment the invention can realize a one-way transmission of the torque and also can realize an overload protection effectively. The reasonable design of the pressure arm unit can supply the stable brake moment.

The embodiment of the invention relates to the technical field of electronic devices and discloses a motor driving signal generating method which comprises a step of acquiring an acceleration segmentsignal, a constant segment signal and an attenuation segment signal, wherein the frequencies of the constant segment signal and the attenuation segment signal are smaller than that of the accelerationsegment signal, a step of connecting the acceleration segment signal and the constant segment signal and reserving a silent period without signal output between the braking segment and the constant segment to obtain a first motor driving signal, a step of adjusting the constant segment signal parameters of the first motor driving signal according to a vibration sensing demand and splicing the attenuation segment signal to the adjusted first motor driving signal to obtain a second motor driving signal, and a step of adjusting the attenuation segment signal parameters of the second motor driving signal to obtain the second motor driving signal with the highest braking efficiency and determining the second motor driving signal with the highest braking efficiency as a final motor driving signal. A low-frequency heavy tactile effect can be achieved when the motor vibration is controlled, and the fidelity of a specific tactile effect in scenes such as game and car central control screens isimproved.

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 invention discloses an electric-hydraulic composite braking system for an electric automobile and an optimization method of the electric-hydraulic composite braking system. The electric-hydraulic composite braking system for the electric automobile comprises a motor regeneration braking force module, a hydraulic braking force module and a composite braking force control module. The motor regeneration braking force module comprises two hub motors, a brake pedal position sensor, four wheel speed sensors, an automobile speed sensor, a super-capacitor, a two-quadrant DC-DC converter and a first ECU. The hydraulic braking force module comprises an oil pump motor, a hydraulic oil pump and a second ECU. In the traveling process of the automobile, through detection of the automobile speed and the wheel speed of automobile traveling and brake pedal position signals, the composite braking force control module controls the distribution ratio between the motor regeneration braking force module and the hydraulic braking force module. Meanwhile, through multi-objective optimization conducted on the electric-hydraulic composite braking system, the braking pedal feeling and motor recovered energy serve as objects, and under the ECE laws and regulations, the relatively high energy recovery rate and the proper brake pedal feeling are obtained.

The invention discloses an eddy current and friction brake device for vehicles. The eddy current and friction brake device comprises a brake disc, a brake caliper, a first annular sector eddy current retarder and a second annular sector eddy current retarder. The brake caliper holds the upper portion of the brake disc. The first annular sector eddy current retarder and the second annular sector eddy current retarder symmetrically hold two sides of the brake disc relative to the brake caliper. Each annular sector eddy current retarder is formed by two rows of electromagnets on two inner annular sector faces of an annular sector frame. The eddy current retarders and the friction brake are integrated according to the principle of advantage complementing, eddy current brake is used when the vehicle runs at high speed, and the brake caliper is used for friction brake when the vehicle runs at low speed. By the eddy current and friction brake device for vehicles, safety, economy, stability, comfort level and efficiency in vehicle braking are improved. The eddy current and friction brake device for vehicles is compact and simple in structure, convenient to mount and easy to maintain.

A brake system, especially for a generator, including a rotor assembly, a stator assembly and a rotation axis is disclosed. The rotor assembly includes an outer portion which is located radially outward of the stator assembly. The outer portion includes a brake disc, and the stator assembly comprises at least one frictional member operatively configured for frictionally engaging at least a portion of the brake disc.

The invention relates to a safe and efficient operation active adhesion controlling method for a motor train unit. The method comprises the following steps: S1, designing an adhesion torque observer for estimating an adhesion torque il between train wheels and a rail in real time according to a single-axis dynamical model and the full-dimensional state observer principle; S2, deriving an adaptive limiting torque Tlim of a traction motor according to the adhesion torque il, a body acceleration value a and a variable step length algorithm; and S3, designing an adhesion controller according to the daptive limiting torque Tlim of the traction motor and a motor output torque index value Tm* given by a superior traction control system, to coordinate traction control and adhesion control. The method effectively improves the traction braking efficiency of a train, reduces wheel-rail wear, strengthens safe and stable operation of the train, prolongs the service lives of wheels and rails, improves the comfort of passengers and reduces energy consumption of the train.

A braking device for a motorcycle, in which front wheel braking means is operated in conjunction with a braking operation on a rear wheel, eliminates a rapid change in front / rear braking force distribution at the time of a rear wheel braking operation so as to consistently allow a rider to feel a smooth braking operation. Braking force distribution characteristics on the rear and front wheels are previously set for each vehicle speed. When the braking operation on the rear wheel is performed, a brake caliper on the front wheel is controlled so as to maintain braking force distribution characteristics corresponding to a vehicle speed when the operation is started.

A variable ratio brake pedal assembly includes a support bracket having a mounting face and two spaced apart side arms extending from opposing edges of the mounting face. The brake pedal assembly also includes a pedal arm pivotally mounted to the support bracket at a first pivot point, and having a pedal pad mounted to a lower end of the pedal arm. The brake pedal assembly also includes a pedal link having a first end and a second end, such that the first end is pivotally connected to the pedal arm at a third pivot point, and a brake booster link having a first end and a second end, and the first end of the brake booster link is pivotally mounted to the second end of the pedal link at a fourth pivot point and the second end of said brake booster link is pivotally mounted to the support bracket at a second pivot point. The brake pedal assembly further includes a brake booster rod attaching means located on the brake booster link at a fifth pivot point, such that the fifth pivot point is located on the brake booster link so that a distance between the second pivot point and the fifth pivot point is less than a distance between the second pivot point and the fourth pivot point.

A wheel hub drive system with an electric motor that can be arranged inside a wheel rim, whereby the electric motor is formed by rotor that is at least indirectly joined to a wheel hub and by means of a stationary stator that can be supplied with alternating current. With an eye towards obtaining more space for the vehicle occupants, it is proposed to arrange the converter with its entire power electronics unit on the stator so that the wheel hub drive system can be operated with direct current from the battery of the vehicle, or else no alternating current lines have to be laid in the vehicle. Consequently, the alternating current is generated by the converter that is arranged in a converter housing attached axially next to the stator.

The invention relates to a brake system for a wind turbine with an integrated rotor lock, a generator and a wind turbine. A brake system, especially for a wind turbine generator (6), is provided. The brake system comprises a rotor lock system (17) which is integrated in the brake system.

The invention provides an energy recovery method and an energy recovery device for an electric car. The method comprises the steps of when detecting that the electric car currently meets an energy recovery activation condition, computing a maximum recoverable torque T_max (MotorBrake) of a whole car according to theoretical torque of a front motor and a rear motor; detecting the working condition of the electric car, if the car is in the brake condition, computing designed brake torque T (Brake) of the whole car according to a current road adhesion coefficient, if the T_max (MotorBrake) is not less than the T (Brake), only applying braking forces to the front and rear motors without applying hydraulic braking forces to a front shaft and a rear shaft, and if the T_max (MotorBrake) is less than the T (Brake), applying the hydraulic braking forces to the front and rear shafts, and meanwhile applying the braking forces to the front and rear motors. According to the method and the device provided by the invention, energy recovery of the dual-shaft dual-motor electric car is achieved.

An empty / load brake control system mountable on a sprung and an unsprung member of a railway car and disposed between the car brake control valve and brake cylinder for adjusting the brake cylinder pressure during a brake application according to the car load condition. Such system includes an empty / load sensor valve device and a sensor arm coupled to a sensor cable whose movement is controlled by a sprung member and a terminal member disposed on an end of sensor cable, in contact with sprung member so that any downward movement of sprung member forces such terminal member in a similar downward direction and similarly pulls on the sensor cable. A piston, under pressure, urges the sensor arm to rotate and retract sensor cable but must overcome resistance of a spring. The system includes a load proportional valve.

The new-type electric car operates on gyro rotation principle and has one balancing turntable to maintain the car body always in balance state inside it. The electric car includes a car body and wheels on two sides of the car body, and operating the handle to control the wheel driving system via the driving shaft can drive the car forwards, turn the car or brake the car. The balancing turntable rotates around its shaft at high speed to make the car body produce centripetal force to maintain its balance. The wheel driving system turns or brakes the car body via magnetic field conversion. Compared with available electric car, the present one has no demerits of unbalanced car body, easy-to-wear brake rubber.

The invention relates to a power distributed type electric logistic vehicle. The electric logistic vehicle comprises a first carriage with a steering drive module, and a plurality of connection carriages with power-driven modules, wherein the first carriage is connected with the connection carriages through one electromagnetic force hook, and the adjacent two connection carriages are connected with the electromagnetic force hooks; the corresponding connection surface between the first carriage and the connection carriages, and the corresponding connection surfaces between the adjacent connection carriages separately adopt an arc surface structure. The electric logistic vehicle disclosed by the invention is simple in structure, high in transporting efficiency, large in pulling force and flexible to organize and steer, resources are saved, and the number of the connection carriages can be selected according to the quantity of the goods; besides, distributed type drive is adopted, so that the drive of each of the carriages is mutually independent, and interactive independent control is adopted.

The invention discloses a method for controlling the torque change rate of a permanent magnet synchronous motor. The method comprises the following steps of a detecting step: detecting the three-phase current and rotary speed of an armature of the motor during operation in real time; a converting step: converting the detected armature three-phase current into a motor alternating-direct axle current based on Clark-Park conversion and calculating a corresponding alternating-direct axle voltage; a torque adjusting step: calculating a modulation factor Mindex based on the alternating-direct current and voltage obtained in the conversion step and adjusting the outputted torques at different torque change rates in a sectional mode according to the range of the modulation factor Mindex value. According to the method and device for controlling the torque change rate of the permanent magnet synchronous motor, a relatively faster torque responding speed is adopted during the control of the maximum torque current ratio, and a relatively smoother torque responding speed is adopted during flux weakening control. The motor is stable in torque outputting, strong in antijamming capacity and fast in accelerated speed and the system is high in brake efficiency. Current impact of the system during high speed can be effectively prevented and the motor in flux weakening control is prevented from being out of control.

The invention discloses an integrated brake device for bogie of rail wagon, which comprises a front brake beam (1), a front brake lever (2), a front brake chain (3), a bi-directional self-regulating stroke force-increasing brake cylinder (4), a rear brake chain (5), a rear brake lever (8), a rear brake beam (9) and a brake shoe (10). The integrated brake device for bogie of rail wagon provided in the invention is simple and compact in structure and convenient and easy to assemble, the integrated brake device for bogie of rail wagon reduces self weight of the vehicle effectively and improves loading capacity of the vehicle.