110 results about "Brake response time" patented technology

The invention relates to a method and a system for testing the brake of a high-speed motor train unit. The method comprises the following steps of: in a stationary state of a motor train unit, simulating various speed signals, train air spring load signals and regeneration brake analog signals by utilizing the testing system; after various analog signals are received by the motor train unit, applying a brake action by a train brake system, and outputting brake information; and acquiring and analyzing brake information data and judging whether the design requirements for various performance indexes of the brake system are met. According to the method and the system, in the stationary state of the motor train unit, various performance indexes of the motor train unit brake system can be comprehensively and effectively tested through simulating the train speed signals and the train air spring load signals, wherein the performance indexes comprise brake response time of the motor train unit, logic motions of an anti-slip system, regenerated brake feedback, air brake, sequential coordination control of regenerated brake, and the like, so that intensive study of complete train debugging key technologies of the motor train unit is realized so as to achieve the purpose of all-around high-precision analogue simulation of the test of the brake system.

The invention discloses an unmanned vehicle remote control brake performance testing and assessment method. A judgment vehicle is adopted to perform comparison testing on the brake response time and speed of an unmanned vehicle, a GPS mobile station and a wireless transmitting-receiving device are arranged on the unmanned vehicle, a GPS mobile station and a wireless transmitting-receiving device are arranged on the judgment vehicle as well, another GPS base station is arranged, the GPS mobile stations are positioned in a GPS differential positioning mode, GPS information transmission is performed through the wireless transmitting-receiving device of the unmanned vehicle and the wireless transmitting-receiving device of the judgment vehicle, and GPS information is transmitted to a background Pc to perform calculation processing. The unmanned vehicle remote control brake performance testing and assessment method effectively solves the problem that at present, the unmanned vehicle remote control brake performance testing and assessment are difficult based on a differential positioning technology and a wireless transmission technology.

The invention discloses an automobile high-speed tire explosion emergency braking stability control system, comprising a power source part of an automobile tire explosion emergency braking system, a control part of a tire explosion emergency braking stability system and a hydraulic anti-lock braking part. When a tire explosion signal is monitored by an automobile tire explosion monitoring system, an emergency braking mode is determined according to the tire explosion state (tire explosion target wheel orientation and number of tire explosion wheels) and the automobile motion state; an emergency braking system works to perform automobile automatic brake after tire explosion under the action of a working mode switching valve; and on the basis of a conventional hydraulic ABS hardware, the emergency braking control system unit is used for calculating the automobile motion state, sends an automobile stability control instruction to an ABS control unit to control and regulate the braking pressure in each wheel braking cylinder of an automobile, and ensures that the speed is lowered to a safe speed range until the automobile stops according to an anticipated automobile path as soon as possible. The system in the invention can remedy the delay problem of braking response time of a driver and assist the automobile with exploded tires to realize safe stopping.

The invention discloses a detection method of braking response time of a brake of an elevator. A method for detecting the braking response time of the brake of the elevator by the aid of a band brake micro-switch is relatively large in error and low in accuracy. According to the method, a spring plate with a resistance strain gauge attached is additionally mounted at one end of each brake spring, when the brake performs braking, the compression amounts of the brake springs are gradually reduced, when the brake completes braking, the compression amounts of the brake springs are minimum, the strain of the spring plates is minimum at the moment, the strain of the resistance strain gauges is also minimum, the change of the brake springs is detected through the resistance strain gauges and strain indicators, the braking response time of the brake is the time difference between an outage signal and the minimum strain moment of the resistance strain gauges, and the time difference can be directly read through a two-channel oscillography recording instrument. The method has the very high detection accuracy and universality and is also easy to operate.

The invention provides an electric brake, comprising a shell (17), a brake disc (15), a brake block and a power mechanism which can push the brake block to move forwards so as to clamp the brake disc, wherein the power mechanism comprises a motor (1) and a movement mechanism which is connected with an output end of the motor, the movement mechanism can transform the rotating movement of the motor into straight line movement, and the brake block is arranged in front of the movement mechanism. The electric brake is characterized in that: the power mechanism also comprises a torque amplification mechanism which is arranged between the motor and the movement mechanism, an input end of the torque amplification mechanism is connected with the output end of the motor, and an output end of the torque amplification mechanism is connected with the movement mechanism. The electric brake is compact in structure, is short in brake response time and can generate greater brake clamping force.

A pressure control method for a brake cylinder of a magnetically levitated train comprises the steps that the error between an actual value of the brake cylinder pressure and a final target value of the brake cylinder is worked out and recorded as a target error; the error between the actual value of the brake cylinder pressure and a target value of the impulse limit of the brake cylinder is worked out and recorded as a transient error; a first threshold value and a second threshold value are set; when the target error is larger than the first threshold value, an inflating and deflating electromagnetic valve is opened normally; when the target error is larger than the second threshold value but smaller than the first threshold value, the open time of the inflating and deflating electromagnetic valve during one control cycle is adjusted according to the transient error and recorded as a rough adjusted duty ratio; when the target error is smaller than the second threshold value, the open time of the inflating and deflating electromagnetic valve during one control cycle is adjusted according to the transient error and recorded as a fine adjusted duty ratio; and the rough adjusted duty ratio is larger than the fine adjusted duty ratio. The method is conducted based on the target pressure and the impulse limit target, on the premise that the impulse limit target and the target pressure of the brake cylinder are met, more precise control can be achieved, the brake response time is shortened, the brake distance is decreased, and the steady-state performance of the brake cylinder is improved.

The invention discloses an integrated engine braking device (engine retarder) with mechanical chaining and a method for changing the movement of an engine air valve. A driving mechanism of the device is partially or completely integrated in one or more components of a vent valve train of the engine and can move between a non-operating position and an operating position. On the non-operating position, the driving mechanism retracts and is separated from the normal operation of the engine; and on the operating position, the driving mechanism extends out to form mechanical chaining, and the vent valve of the engine is opened to generate the operation of braking the engine. On the top of the valve lift curve, the resetting mechanism of the device leads the driving mechanism to retract from an extending position so that the valve lift curve can be reset to be small. The invention also provides a method for changing the movement of the engine air valve, comprising the steps of operating and resetting the braking device. The device adopts the mechanical chaining, has simple structure and reliable running, avoids the problem of great compression of hydraulic chaining and reduces the braking response time.

A braking test for a high lift system. The system including a plurality of high lift surfaces movably arranged at a wing, a plurality of drive stations coupled with the high lift surfaces via a transmission shaft, a power drive unit coupled with the transmission shaft including an electric motor operably coupled with a brake, and a control unit operably coupled to the power drive unit. The control unit executing a method for testing the brake, including actuating an electric motor, acquiring a sensor output of a sensor coupled during the actuating of the motor and determining a motion of the motor, activating a selected brake under test, measuring an elapsed time until the brake has arrested the motion, and determining if the elapsed time is less than a threshold. Generating a brake failure signal for the selected brake if the elapsed time exceeds the threshold.

The invention discloses a monitoring method of a braking fault of an elevating mechanism in a crane. In the method, calculation of a braking time, a braking response time, a braking distance and a braking acceleration are carried out with installation of a braking fault monitoring system on the elevating mechanism in the crane, through detection of rotational speed and the number of rotation of a high-speed shaft or a low-speed shaft of the elevating mechanism, and by means of output of a braking control signal from a braking control circuit to a mechanical brake and output of a time point of a brake feedback signal from a feedback contact in the mechanical brake; and then differences between the four calculation values and a preset hidden danger threshold value, an early warning time threshold value and a fault threshold value are analyzed, thereby obtaining brake early warning or brake protection signals. The monitoring method can not only achieve early warning of a fault hidden danger of the brake system and protection of the fault, which is beneficial to elimination of the fault within an earlier stage for avoiding accidences; but also being beneficial for maintainers to quickly detect the fault with cooperation of positioning a fault point, thereby reducing a maintaining time.

The invention discloses a braking control method for a maglev train. The braking control method comprises the steps that the maximum electric braking force A is applied according to a received braking instruction; required electric braking force B obtained by the braking instruction is acquired; and whether the maximum electric braking force A is smaller than the required electric braking force B or not is judged, if yes, electric braking continues being carried out according to the maximum electric braking force A, and if no, electric braking is carried out according to the required electric braking force B. The invention further discloses a braking control system for the maglev train and the maglev train comprising the braking control system. According to the braking control method, the problems that according to an existing method, the braking response time is long, and electric braking is not fully utilized can be solved, the braking response time and the braking distance can be shortened, the advantages of electric braking is given to maximum play, accordingly the safety of the system is improved, and the problems of high energy consumption and high maintenance cost are solved.

The invention relates to the technical field of automobile braking and particularly discloses an electric power-assisted braking system used for an automobile. The electric power-assisted braking system comprises a braking force output hydraulic module, a braking force input mechanical module, an electric power-assisted input module and a control assembly. The electric power-assisted input module comprises a motor, a transmission module and a sensor. The braking force input mechanical module directly acts on the braking force output hydraulic module through a coupler. The motor is connected with the coupler through the transmission module. The control assembly is used for setting a control strategy and is in electrical signal connection with the motor and the sensor. According to the electric power-assisted braking system used for the automobile, the modular design is adopted, the braking response time is shortened, the braking reliability and the braking efficiency are improved, and the occupied space is reduced; the braking system is provided with a protection unit with redundant measures and has a driver pedal force braking way and a motor braking way, and a traditional operation mode by a driver is retained; and the control mode can be adjusted, man-machine interaction can be conducted, a plurality of driving styles are provided, and the electric power-assisted braking system can meet the braking requirements of automatic driving and can further be matched with a regenerative braking system to achieve braking together.

The invention discloses a braking device of a toothed solid chain type engine, and the braking device comprises a first plunger piston and a second plunger piston arranged in vertical plunger piston holes, and a plunger piston rotation driving mechanism. The lower end surface of the first plunger piston and the upper end surface of the second plunger piston are respectively provided with a tooth surface; the tooth surfaces are matched with each other; a matching non-operating position and an operating position exist between teeth of the two matched tooth surfaces; at the non-operating position, tooth crests of teeth of the first plunger piston are aligned with tooth roots of teeth of the second plunger piston; at the operating position, the tooth crests of the teeth of the first plunger piston are aligned with tooth crests of the teeth of the second plunger piston; and the plunger piston rotation driving mechanism enables the two matched tooth surfaces of the two plunger pistons to rotate between the non-operating position and the operating position. By using the braking device of the toothed solid chain type engine, the height, the volume and the weight of the engine cannot be increased or can be increased less; the design is simplified; the cost is decreased; the braking response time is reduced; the solid chain interlinkage is adopted; the lifting of a braking valve can adopt a smaller value; and the requirements on a gap of a piston and an air valve of the engine can be decreased.

A safety distance estimation device and method which can calculate the driver brake reaction time stored in the storage module by the calculation module, Driver Brake Response Time, Brake decelerationof the vehicle, Front brake deceleration, the minimum safety distance to be kept when the two vehicles are stationary and the estimated safety distance between the vehicle speed and the vehicle speedin front detected by the detection module, and further based on the perceptual characteristic value given by the simulation test module, Judging characteristic value and operating characteristic value, and correcting and estimating safety distance of vehicle type and driving road type obtained by judging module can effectively avoid that the estimated safety distance is too large or too small, which not only improves the accuracy of distance estimation and anti-collision probability of the system, but also ensures driving and riding comfort and driving efficiency.

The invention provides a piezoelectric driving brake comprising a wiring column positive electrode, a wiring column negative electrode, a piezoelectric assembly, a first end face located on the outerside of the piezoelectric assembly, a second end face located on the inner side of the piezoelectric assembly, a displacement enlarging mechanism, an inner brake friction piece, an outer brake friction piece, a gap adjusting bolt for adjusting the gap between the inner brake friction piece and the outer brake friction piece and a floating type brake clamp shell. The piezoelectric assembly comprises a piezoelectric negative electrode layer connected with the wiring column positive electrode and a piezoelectric positive electrode layer connected with the wiring column negative electrode, whereinthe piezoelectric negative electrode layer and the piezoelectric positive electrode layer are alternately arranged. After being powered-on, the piezoelectric assembly moves to deform, so that the gapbetween the inner brake friction piece and the outer brake friction piece is decreased, and the displacement deformation of the piezoelectric assembly is enlarged through the displacement enlarging mechanism. According to the piezoelectric driving brake, car brake adjustment can be achieved, the brake response time is prolonged, the travelling safety of a car is ensured, and meanwhile the gap between the inner brake friction piece and the outer brake friction piece can be adjusted.

The invention discloses an automobile braking system adopting an electric execution mechanism, and belongs to the technical field of automobile braking. The system comprises an execution motor, two fixed gears and two rotating nuts, wherein the two fixed gears and the two rotating nuts are symmetrically arranged on two sides of a brake disc; the two rotating nuts are separately and fixedly connected with two planar bearings; the two planar bearings are respectively separately and fixedly connected with two spring bases; springs are arranged in the two spring bases; the two springs are respectively and separately connected with two push rods; the two push rods are respectively and separately connected with two friction sheets; the two friction sheets are respectively and symmetrically arranged on the two sides of the brake disc; and the braking of the two friction sheets are realized while the braking disc is clamped at the same time. According to the automobile braking system disclosed by the invention, the total quality of the automobile is reduced, the maintenance is simple, braking force directly acts upon the brake disc, and the braking speed is higher, and the braking response time is obviously shorter than conventional automobile braking time, so that the braking efficiency is effectively improved, the braking distanced is shortened, and the security of vehicles is improved.

An aerodynamic brake booster stiffening plate is provided which attaches to pivot posts of a center pull brake system. The aerodynamic brake booster stiffening plate mitigates outward bending of the posts upon actuation of the brake to allow for faster brake response times. Additionally, a front surface of the aerodynamic stiffening plate may be aerodynamically shaped and blended with the fork or frame of the bicycle to encourage a laminar flow of air past the brake.

The invention provides a portable trailer pneumatic braking response time integrated measuring device which comprises a simulation brake trigger, a tractor pneumatic circuit simulating device and a data acquisition device. The simulation brake trigger comprises a manual-controlled mechanical valve body and an accessory, and is connected with a tractor pneumatic circuit simulating device; the tractor pneumatic circuit simulating device comprises a gas storage device, a pipeline damping adjusting device and a pipeline pressure collector; a part of the pipeline pressure collector is fixed on theupper part of the tractor pneumatic circuit simulating device and is connected with the air storage device, and the other part is connected with the brake air chamber of the tested trailer. The pipeline pressure collector is connected with the data collector through an analog input channel. The data collector is also connected to the upper computer. The invention is convenient to carry, high in integration, fast and accurate in data analysis and processing, greatly improves the working efficiency of the response time measurement of the trailer pneumatic braking system, and greatly enhances theconvenience of the test work.

The invention relates to a brake, in particular to a wet brake for a tractor. The brake comprises a shell body, pistons, friction piece components, friction limit mechanisms and piston return mechanisms, wherein each friction limit mechanism comprises a friction positioning rod, a friction resistance ring and a first clamping spring; each friction positioning rod is provided with a first positioning shaft shoulder and a second positioning shaft shoulder from left to right; each friction positioning rod is connected with the corresponding friction resistance ring through a friction pair; each piston return mechanism comprises a pull rod and a disk spring; each pull rod is connected with the shell body in a sliding way; the right end of each pull rod is in threaded connection with the corresponding piston; the sum of the static friction between each fiction positioning rod and the corresponding friction resistance ring is greater than the sum of the maximum force of all disk springs. By the wet brake for the tractor, the dragging caused by a return gap can be overcome effectively, the service life is prolonged by over 20 percent, the automatic compensating function for the abrasion of a friction piece is provided, the return gap of each piston is kept at the range of 0.4-0.6 mm all the time, and the problems that the brake response time is long and the liquid amount required for braking is deficient caused by an over-large brake gap are avoided.

The invention discloses a sensory evaluation method for a brake pedal of a passenger vehicle based on an intelligent unmanned test platform. The sensory evaluation method comprises the following steps: performing a vehicle brake response test, and evaluating sensitivity of the brake pedal of the vehicle by a brake response time, wherein the shortest brake response time corresponds to the highest sensitivity of the brake pedal; testing linearity of the brake pedal of the vehicle, recording an applied brake force and a corresponding brake deceleration, and evaluating the linearity of the brake pedal of the vehicle according to a squared value of a linear correlation coefficient, wherein the linear correlation coefficient is R, and R2 is an element of a set (0,1), when the R2 is the closest to 1, the linearity of the brake pedal of the vehicle is the best. In the formula, Y is the applied braking force, X is the brake deceleration corresponding to the applied brake force, [Y-bar] isan average value of scattered points of the brake force, and [X-bar] is an average value of the scattered points of the brake deceleration. The sensory evaluation method of the invention uses a brakepedal sensitivity test and a brake pedal linearity test to evaluate sensory performance of the brake pedal of the vehicle, and has high test accuracy and good evaluation effect.