198results about How to "Shorten braking time" patented technology

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.

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.

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 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.

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.

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 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 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.