200results about How to "Shorten braking time" patented technology

The invention discloses a hub-motor-driven automobile electromechanical fluid redundant braking system and a control method. The control method of the braking system comprises the steps that is a hubmotor is utilized preferentially to conduct regenerative braking, an electro-mechanical-type braking system is used for traveling braking compensation and parking braking, a hydraulic braking system is used for failure compensation, and the three sets of braking systems are synergetic; and current automobile condition information and driver operation are obtained through an automobile controller,the driving intention is recognized, the automobile stability state is monitored, the road surface condition and the power battery state are synthesized, the braking mode is judged, the total brakingtorque demand is solved, braking torques of four wheels are reasonably distributed, and a hub motor controller, an electro-mechanical-type braking system controller and an electric mechanical brakingbooster are synergetic to conduct braking control to reach the braking target jointly and guarantee traveling stability. The hub-motor-driven automobile electromechanical fluid redundant braking system and the control method can achieve efficient braking energy recovery and four-wheel active-distribution-type braking, and have the advantages of being high in braking capacity, high in sensitivity,quick in response, high in safety, high in reliability and the like.

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 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.

A motor drive apparatus includes an inverter which has an upper and lower arms each provided with a plurality of semiconductor switching devices and free-wheeling diodes connected in reverse parallel with respective ones of the plurality of semiconductor switching devices, wherein the semiconductor switching devices are controlled on and off to convert DC to AC, a short-circuiting unit which includes a selector switch between motor phase windings of a synchronous motor, the selector switch being opened and closed under the control of a command, and a dynamic braking control unit which, upon reception of a dynamic braking start command, performs control so as to turn on all of the semiconductor switching devices provided in either one of the upper and lower arms and to turn off all of the semiconductor switching devices provided in the other arm, and thereafter controls the short-circuiting unit so that the selector switch is closed.

The invention relates to an electromotor energy storage braking system and a control method, and belongs to an energy storage braking system and a control method used for storing and recycling energy generated in the process of electromotor braking. The electromotor energy storage braking system and the control method mainly solve the technical problems that an existing energy storage device is small in stored energy, large in interference to a power grid, inconvenient to use and the like. The electromotor energy storage braking system comprises a main electromotor, a rectifier, a main inverter, a direct current bus, a filter capacitor, a control computer, a first pulse width signal generator and a first driving module, and further comprises a motor rotary speed controller, an electromotor or a generator, a hydraulic pump or a motor, a two-position three-way control valve, a hydraulic energy accumulator, a safety valve, a pressure sensor, a rotary speed sensor, a hydraulic oil tank, a voltage sensor, a second pulse width signal generator and a second driving module. The electromotor energy storage braking system and the control method have the advantages of achieving active control to the process of electromotor braking, saving energy, reducing consumption, achieving energy saving and emission reduction and the like.

The invention relates to a chuck (1) for a machine tool for machining a tubular workpiece (26) which rotates about a rotational axis that coincides with the centre of the chuck, comprising at least two chucking slides (7a, b, c) that are designed to be positionable radially with respect to the rotational axis in order to release and chuck the workpiece, are arranged on the end side of and in a manner distributed uniformly around the circumference of a chuck head plate, and bear chucking jaws (8a, b, c). Such a chuck is intended to be created with improved operating characteristics and extension to all chucking functions. To this end, for the external central chucking of a tube (26), there are provided centring slides (27a, b, c) which can be disengaged from the chuck head plate with a forward inclination towards the end of the tube to be machined and centre the tube by means of chucking claws (29) which are arranged at the front, free end of centring slide rods (28), said centring slides (27a, b, c) engaging via a toothed rod section (34) into a toothing (35) of a drive means assigned to each centring slide, and meshing for their part, on a toothing side (37) parallel to the side with the toothing, with a central toothed wheel (33) arranged concentrically with the rotational axis, wherein the central toothed wheel (33) synchronizes the movements of all the centring slides (27a, b, c).

The invention provides a linear motor braking method and device as well as a tactile feedback system. The braking method comprises the steps as follows: S100, detecting vibration information of a linear motor in a vibration state and obtaining the vibration speed of the linear motor through analysis; S200, inputting an initial braking driving signal having the opposite phase with the vibration speed to the linear motor so as to reduce the amplitude of the linear motor initially and realize initial braking of the linear motor; S300, detecting the vibration information of the linear motor after initial braking; S400, analyzing the vibration information detected in S300 and obtaining a feedback braking driving signal according to an analysis result of the vibration information; S500, inputting the feedback braking driving signal to the linear motor after initial braking to reduce the amplitude of the linear motor again and realize secondary braking of the linear motor. With the adoption of the method, quick reduction of the amplitude of the linear motor can be realized, the braking time can be shortened, and the quick braking function of the linear motor can be realized when the amplitude of the linear motor is very small.

Brake mode switching signal production means detects the number of revolutions per unit time of a rotor according to a change in a positional relationship between motor windings of a plurality of phases and the rotor so as to output first and second brake mode switching signals for selecting either a short brake mode or a reverse brake mode for braking the rotation of the rotor based on the number of revolutions. Control means outputs an energization control signal for controlling energization of the motor windings of a plurality of phases in response to the first and second brake mode switching signals. Thus, it is possible to reduce the braking noise and the stopping time.

The invention is directed to a method for braking an electric drive motor having a stator and a rotor. The stator has field coils which have electrical phase connections for three motor phases. To generate an electromagnetic rotating field driving the rotor, the phase connections are connected to a supply voltage via switches actuated by a control unit which closes the switches depending on the rotary position of the rotor. To brake a rotating rotor, a braking current is generated by short-circuiting the phase connections. A phase short circuit is switched in between each two phase connections of the field coils with a preset temporal sequence to brake the rotor. The phase connections short-circuited are each selected corresponding to the rotary position of the rotor so that that field coil is short circuited in which the voltage induced by the magnetic field of the rotating rotor passes through its maximum.

The invention belongs to the field of rigid mining dump trucks, and particularly relates to a braking device of a heavy-duty mining dump truck. The braking device comprises an oil tank, a brake pump, a braking multiple-unit valve, a pedal braking valve and a front brake, an oil suction port of the brake pump is connected with the oil tank, an oil outlet of the brake pump is connected with the braking multiple-unit valve via a filter, the braking multiple-unit valve is respectively connected with a parking braking valve and the pedal braking valve, the pedal braking valve is respectively connected with the front brake and the parking braking valve, and the parking braking valve is respectively connected with a rear brake and a parking brake. Since the braking multiple-unit valve, the parking braking valve and a loading braking valve are arranged to enable the braking device of the heavy-duty mining dump truck to realize functions of driving brake, parking brake, loading brake, emergency brake and automatic brake, safety and reliability of the truck are effectively improved.

The invention discloses a permanent magnet linear motor-based throwing platform, which comprises a base, two oppositely arranged iron yoke backplates, stator teeth, a permanent magnet rotor, an eddy current braking device and a control mechanism, wherein the iron yoke backplates are fixed on the base; each iron yoke backplate is provided with more than one row of stator teeth along the height direction; two stator teeth at corresponding positions on the different iron yoke backplates form a group; the stator teeth are wound with a three-phase winding connected with the control mechanism; the permanent magnet rotor is arranged in a motion channel formed between the two iron yoke backplates; the motion channel is divided into a front-end accelerating section and a tail-end braking section along the motion acceleration direction of the permanent magnet rotor; and the tail-end braking section is provided with the eddy current braking device. The permanent magnet linear motor-based throwing platform has the advantages of simple and compact structure, low cost, good reliability, large throwing force, and stable structure.

A motor drive apparatus includes an inverter which has an upper and lower arms each provided with a plurality of semiconductor switching devices and free-wheeling diodes connected in reverse parallel with respective ones of the plurality of semiconductor switching devices, wherein the semiconductor switching devices are controlled on and off to convert DC to AC, a short-circuiting unit which includes a selector switch between motor phase windings of a synchronous motor, the selector switch being opened and closed under the control of a command, and a dynamic braking control unit which, upon reception of a dynamic braking start command, performs control so as to turn on all of the semiconductor switching devices provided in either one of the upper and lower arms and to turn off all of the semiconductor switching devices provided in the other arm, and thereafter controls the short-circuiting unit so that the selector switch is closed.

The invention relates to an automobile brake device, in particular to an auxiliary urgency braking device on an automobile, which comprises a fixed frame fixedly installed on a back bottom of the automobile and a drag anchor typed brake. The invention is characterized in that: the brake of drag anchor type has a drag anchor typed brake body, a plurality of composite brake plates and expansible brake nails are arranged on the drag anchor typed brake body, wherein, the brake nails are connected with a lifting device of the brake nails; the drag anchor typed brake has a lifting device of the drag anchor typed brake. The invention is controlled by an electric circuit, so the braking time can be saved and the occurrence of car accident can be effectively avoided. The drag anchor typed brake body is provided with pressure springs as well as a plurality of the composite brake plates of wear and high temperature resistance and the expansible brake nails, thus effectively increasing friction and fully playing effective brake function; in addition, when the brake nails are not used, the road is unlikely to be damaged.

The invention discloses an emergent brake device for a vehicle; left and right two brake frames are arranged in a brake clamp of the brake device, wherein the brake frames comprise a first cross bar, a first vertical rod, two brake rods and two brake pieces; one end of the first cross bar is fixedly connected to a brake block; the center of the first vertical rod is vertically connected to the other end of the first cross bar; one ends of the two brake rods are fixedly connected to one end of the first vertical rod; the two brake pieces are respectively and correspondingly fixed at the other ends of the two brake rods; and the brake pieces are perpendicular to the corresponding brake rods. Through the arrangement of the brake frames in the emergent brake device for the vehicle, when the vehicle is emergently braked, if one of the brake pieces is failed, the friction brake of the rest brake piece still can be used, the safety of the vehicle is improved; and meanwhile, the use level of brake oil can be decreased, and the energy is saved.

The invention discloses an elevator intelligent brake control method and device. The control method includes: a brake control system which outputs voltage to a brake coil to allow a brake shoe to be separated form a brake wheel is started, and target floor information is input to the brake control system to allow an elevator car to operate; when the distance between the elevator car and the target floor reaches the preset distance, the brake control system slowly reduces voltage output, magnetic force generated by the brake coil reduces gradually, and a compression spring on the brake arm gradually reduces the distance between the brake shoe and the brake wheel; when the elevator car reaches the target floor, voltage output by the brake control system is cut off, the brake shoe tightly holds the brake wheel, and the elevator car stops operating. By the method, brake time during elevator stopping is reduced, and safety hazards such as sliding when the elevator control system fails. Due to the fact that the distance between the brake shoe and the brake wheel is reduced, noise caused by collision of the brake shoe and the brake wheel is reduced. The invention further provides an elevator intelligent brake control device.

The invention discloses a car braking device suitable for a mountain road, which is fixedly arranged at any one position, two positions or three positions between a car gearbox and a driving shaft, between the driving shaft and a hanging basket, and between the driving shaft and a differential device; the car braking device comprises a hydraulic or atmospheric feed system and a damping device; the damping device comprises two fixed mount housings which are fixed together to be sealed, a camshaft with a cam in the middle, and one or more air cylinders or hydraulic cylinders which are arranged in the two fixed mount housings and fixed on the inner walls of the two fixed mount housings; and when a piston rod is ejected, the top end of the piston rod is supported on the cam edge of the cam shaft. According to the car braking device, a small braking force is applied to the driving shaft, and accordingly, a large braking force is generated on wheels, so that the car braking device is labor-saving to brake; and when the car runs downhill, the car braking device can be simultaneously used with a car master braking device, so that the braking time and the braking frequency of the master braking device can be reduced, the temperature of the braking device and the master braking device can be reduced, the dysfunction of the braking can be avoided, and the happening of accidents caused by the dysfunction of the braking can be reduced.

A rotating gantry includes a link frame for supporting a plurality of rollers which rotatably support the rotating gantry, a brake for releasing a braking force applied to at least one of the rollers upon supply of air and applying the braking force to the one roller upon discharge of air, and a solenoid valve for sealing the supplied air in the brake when closed, and discharging the air from the brake when opened. The solenoid valve is supported by a solenoid valve support member mounted to the link frame such that the solenoid valve is positioned just near the brake. The rotating gantry can be more quickly braked and stopped while maintaining high irradiation accuracy.

The invention discloses a high-speed height limiting system, which is applied to the field of a road appliance. The key point of the technical scheme is that the high-speed height limiting system comprises vertical beams symmetrically arranged at both sides of the road and a cross beam for connecting upper ends of two vertical beams; upper ends of two vertical beams are connected through the crossbeam, and two vertical beams are erected with an intercepting screen through a hanging hook; one side of each vertical beam deviating from the intercepting screen is rotationally connected with a first linear wheel, and steel cables are coiled on the first linear wheels; one end of each steel cable is connected to both ends of the intercepting screen, and the intercepting screen is arranged at one side of each vertical beam towards the vehicle advancing direction. The high-speed height limiting system has the advantages that the high-speed height limiting system can reduce the influence on the driving vehicles behind when an ultra-high vehicle is intercepted by the intercepting screen.

In a method for adjusting a parking brake, which includes an electromechanical braking device having an electric brake motor, the brake motor is braked upon reaching an end position.

The invention provides a braking control method, device and equipment and a storage medium. The method comprises the steps that when it is determined that an engine is in the braking working condition, the current rotation speed of the engine is acquired; whether the current rotation speed is higher than preset critical rotation speed or not is determined, wherein the critical rotation speed is the critical speed between a middle-low rotation speed area and a high rotation speed area, the rotation speed in the middle-low rotation speed area is the braking rotation speed commonly used by a user, and the rotation speed in the high rotation speed area is not lower than the maximum rotation speed in the middle-low rotation speed area; if not, the deflation opening degree of a supercharger is controlled to be zero; and if yes, the deflation opening degree of the supercharger is adjusted to a first opening degree value, wherein the first opening degree value is larger than a second opening degree value, the first opening degree value is the deflation opening degree corresponding to the current rotation speed when the engine is in the braking working condition, the second opening degree value is the deflation opening degree corresponding to the current rotation speed when the engine is in the positive work working condition, and the first opening degree value is larger than zero. According to the scheme, variable adjustment of the braking power can be achieved, and then the reliability of the engine is improved.

The invention relates to the field of vehicle installation protection, and especially relates to an intelligent safe accelerator device and a control method. The device comprises a vehicle built-in controller, and a first pressure detection device which is arranged on an accelerator pedal (3) and used to detect stepping pressure of the accelerator pedal. The first pressure detection device is connected with the controller by signals. A vehicle using the device can effectively prevent stepping on the accelerator by mistake, and potential safety hazard of a novice driver is greatly reduced, and braking time in high-speed driving can be greatly reduced, so as to reduce accident rate and accident seriousness. The device can restrain accident rate caused by improper driving habits, such as high overspeed, drunk driving, driving after taking drug, fatigue driving, and anger driving.

The invention discloses a speed control method for a free falling winch and a method for implementing the method. The method effectively controls the speed of a free falling winch system by using the throttling action produced by a hydraulic system. The device comprises a transmission device and a hydraulic transmission system, wherein the hydraulic transmission system comprises a hydraulic pump, a pipeline, a flow control valve, a safety valve and an oil tank; and one end of the transmission device is connected with a winding drum, while the other end is connected with a hydraulic pump. The method can conveniently set and control the maximum free falling speed so that the free falling speed becomes stable after a certain falling height and is not increased along with the change of the falling height; because the production of high speed is controlled, the braking force or the braking time required by a brake is reduced, and the braking becomes smooth so as to reduce the impact on the mechanism; and the abrasion of a braking band (sheet) is reduced. An energy accumulator is connected between the hydraulic pump and the flow control valve for providing a new path for energy reclamation and reutilization and making a contribution to energy conservation and emission reduction.

The invention relates to a brake and power equipment. The brake comprises a first brake part, a second brake part and a drive device, wherein the first brake part is rotationally arranged around the center axis; the second brake part is non-rotationally arranged in the circumferential direction relative to the center axis; the drive device is used for driving the second brake part to reciprocate along the center axis to control the brake to be switched between a brake state and a non-brake state; an axial bulge extending axially along the center axis is arranged at one of the first brake part and the second brake part, and an accommodation space is formed in the other brake part; the axial bulge is located in the accommodation space and forms circumferential limit fit when the brake is in the brake state; when the brake is in the non-brake state, the axial bulge is separated from the accommodation space, so that circumferential limit fit is eliminated. According to the brake, a traditional structure that braking is realized through brake pads is eliminated, the service life of the brake is prolonged, and the safety and the reliability of the brake are improved.

The invention belongs to the field of medical instruments and aims to solve the problem that bleeding points cannot be accurately positioned to achieve autonomous and flexible hemostasis after femoralpuncture. The invention provides a robot for automatically pressing a femoral artery to stop bleeding. The robot comprises a device for stopping bleeding through pressing, a multi-degree-of-freedom mechanical arm and a controller, wherein the device for stopping bleeding through pressing and the multi-degree-of-freedom mechanical arm are both in communication connection with the controller; the device for stopping bleeding through pressing is provided with a blood vessel bleeding point positioning assembly which is used for detecting blood vessel image information of an area requiring hemostasis; and the controller is used for receiving the blood vessel image information detected by the blood vessel bleeding point positioning assembly and controlling the multi-degree-of-freedom mechanicalarm to move according to a preset track based on the received information so as to allow the device for stopping bleeding through pressing to move to a target position and to execute a pressing action for hemostasis. The robot has the advantages that a blood vessel bleeding point can be accurately positioned through a pressure detection assembly and the blood vessel bleeding point positioning assembly, so accurate hemostasis is conducted on the blood vessel bleeding point, pressing force is flexibly adjusted, and expected hemostasis effect is achieved.

The invention discloses a control device for a hydraulic brake of a mining dumper. The control device comprises a hydraulic pump and an oil box, wherein the outlet of the hydraulic pump is connected with a braking pedal valve through a front wheel check valve and a rear-wheel check valve respectively; and the outlet of the braking pedal valve is respectively connected with a front wheel brake and a rear-wheel brake respectively. The control device is characterized in that a front wheel pilot reducing valve and a rear-wheel pilot reducing valve are respectively arranged in the braking pedal valve; the front wheel pilot reducing valve is connected with the front wheel brake through a front wheel shuttle valve, and the front wheel shuttle valve is also connected with a front wheel counterbalance valve; and the rear-wheel pilot reducing valve is connected with the rear-wheel brake through a rear-wheel shuttle valve, and the rear-wheel shuttle valve is also connected with a rear-wheel counterbalance valve. In the control device, the shuttle valves and the counterbalance valves are arranged between the braking pedal valve and the brake, so that certain oil pressure is maintained in the brake during braking removal, the next braking time is reduced, and the braking is quicker.

The invention discloses an active collision-avoidance system based on novel solenoid valve controlling hydraulic braking and a braking method. The active collision-avoidance system comprises a braking pedal sensor, a braking pedal sensing simulator, a wheel speed sensor, an asymmetric hydraulic braking wheel cylinder, a solenoid operated four-way valve, an overflow valve, an oil tank, a hydraulic pump, an energy accumulator, an electronic control unit, a laser radar detection module and a buzzer. A braking master cylinder of a traditional hydraulic braking system is removed, the solenoid operated four-way valve is adopted to replace a complex braking valve, and a traditional braking wheel cylinder is changed into the asymmetric hydraulic braking wheel cylinder. Braking modes can be switched more rapidly by matching the asymmetric hydraulic braking wheel cylinder with the solenoid operated four-way valve, and pressurization, pressure maintaining and pressure reduction of the system can be achieved. The braking pedal sensor is adopted to discover a wrong braking behavior of a driver in time, a vehicle in the front is monitored through a radar system in real time, the distance, direction and relative speed between a vehicle and the vehicle in the front are judged, an alarm can be given if necessary, vehicle active collision avoidance can be achieved through control of an ECU, and it is guaranteed that the vehicle is driven safely.

The invention provides a friction plate assembly, a braking device and a motor. The friction plate assembly comprises a first elastic piece, a first friction plate and a second friction plate, whereinthe first friction plate is coaxial with the second friction plate; the first elastic piece is between the first friction plate and the second friction plate, and the restoring force of the first elastic piece makes the first friction plate and the second friction plate away from each other. The friction plate assembly has a high degree of freedom, and the operation balance can be improved. The braking device with the friction plate assembly can q make a quick response, the operation balance is improved, and abnormal wear is avoided.

A disc type dual brake mechanism and a brake system are suitable for automobiles, trains and airplanes. The brake is provided with a brake disc, a disc flange, a bearing, an elastic body, two brake calipers and a friction plate, the brake disc is arranged on the disc flange in a coaxial small-angle relative rotation mode through the bearing, and the disc flange is installed on the axle, and the elastic bodies are arranged between the two teeth of the disc gear and the disc flange gear respectively so as to form a meshing elastic force, and the two brake calipers are symmetrically arranged on the two sides of the brake disc in a symmetric manner by taking the center of the vehicle axis, when the brake disc and the friction plate are in synchronous friction, a brake coupling moment is generated by the axle, and compared with a brake in the prior art, the full-automatic braking performance is improved by four times; the brake system is formed by the brake, so that the automobile safety is greatly improved.

The invention relates to a chuck (1) for a machine tool for machining a tubular workpiece which rotates about a rotational axis (4) that coincides with the centre of the chuck, comprising at least two chucking slides (7a, b, c) that are designed to be positionable radially with respect to the rotational axis (4) in order to release and chuck the workpiece, are arranged on the end side of and in a manner distributed uniformly around the circumference of a chuck head plate (2), and bear chucking jaws (8a, b, c). The operating characteristics for the central and / or balancing chucking of a tube are improved when each chucking slide (7a, b, c) is assigned firstly transverse slides (9a, b, c) which are provided tangentially to the rotational axis (4) in the head plate (2), are acted upon by an adjusting means and have a slide block (11) formed as a rack (12) on a longitudinal side, and secondly separate toothed wheels (19a, b, c) which mesh with the racks (12), wherein each chucking slide (7a, b, c) is provided on its underside with a driving claw (17) which, in order to deflect the movement of the transverse slide (9a, b, c) in an adjusting movement, extending at right angles to the rotational axis (4), of the chucking slide (7a, b, c), is in engagement with a slot-like guide groove (16) provided in the slide block (11) of the transverse slide (9a, b, c), and wherein the toothed wheels (19a, b, c) are assigned a coupling pinion (20) that can be engaged and disengaged axially with respect to the rotational axis.