173results about How to "Smooth deceleration" patented technology

The invention discloses an emergency braking control method achieved through an electrical park brake. Under the emergency braking condition (for example, a brake pedal is blocked), after status information applied by a park brake switch is collected through an electrical park brake (EPB) system, a command is sent to a vehicle body electrical stable system (ESP) through bus communication, four wheels are braked at the same time through the ESP according to the deceleration value required by the EPB, and if one wheel of a vehicle is locked, the ESP can initiatively execute an anti-lock program. By means of the series of movements, safe and stable braking of the vehicle can be achieved, and person safety and vehicle safety are guaranteed.

A split axis stage architecture is implemented as a multiple stage positioning system that is capable of vibrationally and thermally stable material transport at high speed and rates of acceleration. A split axis design decouples stage motion along two perpendicular axes lying in separate, parallel planes. A dimensionally stable substrate in the form of a granite, or other stone slab, or of ceramic material or cast iron, is used as the base for lower and upper stages. The substrate is precisely cut (“lapped”) such that its upper and lower stage surface portions are flat and parallel to each other.

The invention relates to a method for preventing the voltage of dc bus in transducer from raising. The method includes following steps:. The voltage of dc bus in the transducer is controlled in closed loop, based on detected voltage. The closed loop control is realized by following procedure. Whether the negative operation for the outputting value of the voltage closed loop carriers on or not is dependent on the moving direction of electric motor. That is: when the motor moves in positive direction, the operation needs to execute; when the motor in negative direction, the operation does not need to execute. The invented method can effectively prevent dc bus in transducer from over voltage fault in slowdown process. The invention guarantees the accuracy and smoothness in controlling speed.

A rigid support structure allows for faster and more accurate positioning of axially adjustable optical components in a laser processing system. Vibrational and thermal stability is improved when an optics assembly is housed in a rigid air bearing sleeve that is mounted to a support structure above a specimen stage.

The invention provides a vehicle control method and a system and a vehicle. The control method comprises the following steps: when a vehicle has a flat tire, an electric assistance steering system, an engine control module and a vehicle body electronic stabilizing system are started to automatically control the vehicle; the electric assistance steering system controls a rotating angle of a steering wheel according to a predicted driving trajectory before tire burst, so that the vehicle is maintained on the predicted driving trajectory before tire burst; the engine control module limits an output torque of an engine according to a preset safety torque threshold; and the vehicle body electronic stabilizing system distributes the braking force applied to each wheel according to a target punctured tire to control stable braking of the vehicle. The method can automatically control the vehicle to keep reasonable driving trajectory after tire burst, and stably reduces the speed to improve the safety and the reliability of the vehicle when the vehicle has a flat tire.

The invention discloses an auxiliary brake device applied to a non-drive axle. The auxiliary brake device applied to the non-drive axle comprises an axle shell of the non-drive axle, wherein shaft heads are respectively fixed at two ends of the axle shell, the outer surface of each shaft head is connected with a wheel hub through a bearing, a hydraulic retarder is arranged between the wheel hub and an end portion of each shaft head, each hydraulic retarder comprises a stator impeller fixed on the outer surface of the end portion of each shaft head and a rotor impeller which is covered outside each stator impeller and fixed with the wheel hub, and a hydraulic oil work cavity is formed between the inner surface of each rotor impeller and the outer surface of each stator impeller. An oil inlet pipe and an oil return pipe are arranged on the axle shell, each shaft head is provided with an axial through hole, each axial trough hole forms a part of an oil pipeline passage of each hydraulic retarder, and the oil inlet pipe and the oil return pipe are communicated with the hydraulic oil work cavities through the axial through holes in the shaft heads. The auxiliary brake device applied to the non-drive axle is capable of effectively improving the brake capacity of vehicles, especially a trailer, a semitrailer, a heavy truck and a large bus, and guarantees driving safety.

The invention provides a system for guiding a highway safety vehicle speed in a foggy environment for intelligent connected vehicle, which comprises a road-side device arranged at the road side and a vehicle-mounted device arranged in a vehicle, and a vehicle speed guiding module, wherein the vehicle-mounted device is used for acquiring the visibility information of the road in real time, the visibility information and the real-time operation state of the vehicle are sent to the road-side device through a wide area wireless communication technology, and the best vehicle speed sent by the road-side device is received and serves as reference for a driver; the road-side device comprises an information communication module for communicating with the vehicle-mounted device by using a network communication mode; and the vehicle speed guiding module is used for calculating and analyzing the best vehicle speed according to the real-time operation state information of each vehicle on the road section and the visibility information, and the best vehicle speed is sent to all vehicles on the road section via the information communication module. According to the real-time operation state information provided by each vehicle and the visibility information, the best vehicle speed is calculated for the driver as reference, and traffic accidents due to an overlarge vehicle speed can be avoided.

The invention relates to a deceleration rate control-based antiskid braking system and a deceleration rate control-based antiskid braking method for an airplane. The system comprises a left braking instruction sensor, a right braking instruction sensor, an antiskid braking controller, electromagnetic hydraulic locks, braking control valves, braking pressure sensors and airplane wheel speed sensors. A set of hydraulic source is used for providing pressure, and enters the two electromagnetic hydraulic locks respectively, one braking control valve is connected behind each electromagnetic hydraulic lock, one pressure sensor is connected behind each braking control valve, left and right braking airplane wheels are connected behind the pressure sensors, the airplane wheel speed sensors are mounted in wheel shafts of the airplane wheels, signals of the braking instruction sensors, the pressure sensors and the airplane wheel speed sensors enter the antiskid braking controller, and the braking controller controls the electromagnetic hydraulic locks and the braking control valves. According to the system and the method, the airplane is stably decelerated in a braking process, the deceleration rate can be steplessly regulated, and the braking deceleration stability of the airplane and the comfort of a driver and passengers are improved.

An apparatus for controlling deceleration of a DC motor which is driven in a forward operating direction with a forward-drive electric current applied thereto by a forward driving device, wherein the forward motor driving device applies the forward-drive electric current in the form of pulses to the DC motor during its deceleration, and wherein a plugging-braking device operable while the motor is subjected to a regenerative brake or operated in a non-braked state is operated to apply a reverse-drive electric current in the form of pulses to the motor, to apply a plugging brake to the motor, such that at least one pulse of the reverse-drive electric current follows every predetermined number of pulses of the forward-drive electric current. The plugging-braking device may be replaced by a dynamic braking device operable to short-circuit the motor to apply a dynamic brake to the motor, with at least one pulse of a dynamic-brake current following every predetermined number of pulses of the forward-drive electric current.

The invention is suitable for the technical field of strip steel coiler control, and provides a precise strip steel tail positioning control method for a strip steel coiler. The precise strip steel tail positioning control method comprises the following steps: obtaining a first signal sent by a synchronous grating, wherein the first signal is sent when the synchronous grating detects the tail of strip steel; after confirming that the first signal is that the tail of the strip steel reaches the detected area of the synchronous grating, obtaining recorded revolutions per minute RN, which is updated in real time, of the coiler from an initial state to a current state, and calculating a real-time value of a coiling diameter; calculating length SN from the tail of the strip steel to the coiler in real time according to the real-time value of the coiling diameter and the revolutions per minute RN; and while determining that the length SN reaches speed reduction length Sde used for speed reduction, starting a reduction process. According to the embodiment of the invention, the strip steel rail is precisely positioned, the speed reduction process is started at a proper moment, and a smooth speed set value is designed, so that the speed reduction process is very stable, and good control effect can be obtained.

The invention provides an unmanned aerial vehicle landing smoothly pushed by reverse air pressure, and relates to the technical field of unmanned aerial vehicles. The unmanned aerial vehicle landing smoothly pushed by the reverse air pressure comprises a frame body, wherein propellers are evenly and fixedly installed on the periphery of the frame body, a suspension device is fixedly connected to the inner part of the frame body, a supporting device is fixedly installed at the bottom of the frame body, an air collecting pipe is fixedly connected to the inner part of the frame body through a fixing ring, the air collecting pipe is internally and fixedly connected with a motor through a connecting seat, and the top of the motor is rotatably connected with fan blades. According to the unmannedaerial vehicle landing smoothly pushed by the reverse air pressure, the unmanned aerial vehicle can be enabled to be decelerated steadily and leveled automatically before being in contact with the ground, so that the operate difficulty of the unmanned aerial vehicle is reduced during landing, and the rollover of the unmanned aerial vehicle is avoided; and after taking off is carried out, the supporting device can contract, so that the resistance produced by the supporting device during the flight of the unmanned aerial vehicle is reduced, and the consumption of energy is reduced.

Provided are a conical spring stiffness changing and wrinkle and cracking prevention method, and a product. A conical spring comprises an inner cone, a rubber body, and an outer cone. The rubber body surrounds the inner cone. The outer cone surrounds the rubber body. The rubber body, and the inner cone and the outer cone form a rubber metal spring arranged in a conical manner. The conical spring is characterized in that a rubber body upper rubber profile and a rubber body lower rubber profile of the conical spring use a multisection structure form. The rubber body upper rubber profile is a multisection downhill structure, and the rubber body lower rubber profile is a multisection uphill structure. Through changing the shape, slope, and length of each section, and the number of sections in the multisection downhill structure of the rubber body upper rubber profile and the multisection uphill structure of the rubber body lower rubber profile, the size of stiffness changing and the position of stiffness changing of the conical spring are adjusted, and adjustment of multiple stiffness changing is realized through controlling the number of multisection.

An automatic gear shifting control device of a vehicle can execute an automatic gear shifting control in response to a larger rotational speed. The automatic gear shifting control device includes a gear shifting control instruction part that executes an automatic gear shifting operation of an AMT in response to at least vehicle-speed information. First and second sensors detect rotational speed of front and rear wheels. A rotational-speed-difference detector detects the difference in rotational speed between the front and rear wheels based on information from the first and second sensors. The control part is configured to execute an automatic gear shifting control in response to the vehicle-speed information calculated based on the larger rotational speed out of the rotational speed of the front wheel and the rotational speed of the rear wheel when the difference in rotational speed is detected by the rotational-speed-difference detector.

A specimen inspection stage implemented with a processing stage coupling mechanism provides a capability to conduct with maximum efficiency post-processing specimen inspections on-board a processing platform. Heavy inspection equipment is mounted on a specimen inspection stage that is separate from a processing stage. In a preferred embodiment, the processing stage moves in response to an applied motive force and performs laser-based processing operations on a specimen. While laser processing is ongoing, the specimen inspection stage remains parked in its home position. When it is time for post-processing inspection, a stage coupling and decoupling mechanism couples together the specimen inspection stage and the processing stage, which transports the specimen inspection stage to and from the specimen position.

A method and apparatus for horizontally shifting an article group or article layer, composed of a plurality of articles, from a first position and / or from a conveying movement into a second rest position while largely maintaining the relative positions of the articles in the article layer or group to each other, said transfer being effected by at least one first pusher bar engaging with the articles located at the back of the article group or article layer, as considered in relation to the conveying or feed direction. A support bar, which is at least temporarily allocated to the articles located at the front of the article group or layer, as considered in relation to the conveying direction, moves ahead at a slight distance from or abuts on the foremost articles of the article group or layer at least immediately before or on reaching the rest position.

The target input shaft torque determination unit determines a target input shaft torque. The target output shaft torque determination unit determines a target output shaft torque so that a deceleration force for decelerating the vehicle is generated on the output shaft of the power transmission device in a state in which connection and disconnection states of the forward travel clutch and the reverse travel clutch are maintained at the state before the start of the shuttle action when the shuttle action is started. The torque-balance information is stored in a storage unit and defines a relationship between the target input shaft torque and the target output shaft torque to achieve a balance of the torques of a power transmission device. The command torque determination unit uses the torque-balance information to determine torque commands for the motor from the target input shaft torque and the target output shaft torque.

A brake device for a vehicle is equipped with an electric motor which drives a pump to deliver brake fluid to a wheel cylinder installed in a wheel of the vehicle. The brake device works to control pressure of the brake fluid in the wheel cylinder for creating a target braking force. In response to an increase in stroke of a brake pedal, the brake device elevates the pressure in the wheel cylinder gradually without sharply changing it. This eliminates deterioration of a driver's braking feeling arising from a variation in deceleration of the vehicle and ensures smooth deceleration of the vehicle intended by the driver of the vehicle.

The invention discloses an electric energy recharging operating device, an electric energy recharging operating circuit and an electric energy recharging control method of an electrocar. The electric energy recharging operating device comprises a knob and a reset type elastic pulling handle. The knob is rotated to set an electric energy recharging default value. The reset type elastic pulling handle is pulled to set an electric energy recharging adjusted value from the electric energy recharging default value, and when the reset type elastic pulling handle is left, the reset type elastic pulling handle can reset to a normal position and returns back to the electric energy recharging default value. Electric energy recharging is carried out on the electrocar on electric energy recharging status according to the electric energy recharging adjusted value. The electric energy recharging default value can be set firstly, the electric energy recharging adjusted value can be adjusted timely according to driving conditions of the electrocar, a driver can use the electric energy recharging to do stepless type braking and regenerate energy simply, the electrocar can reduce speed smoothly, and abrasion of braking parts is reduced.

A train braking apparatus includes a pneumatic brake control part (3) for storing a plurality of friction coefficients corresponding to a brake instruction (2D) and initial velocity of a brake, an electropneumatic change valve (4) for converting a pressure control signal (3D) transmitted from the control part (3) into a pneumatic signal, a relay valve (5) for generating brake cylinder pressure (5D) of a predetermined pressure corresponding to the pneumatic signal, and a brake cylinder (7) for controlling each brake shoe (8) according to the brake cylinder pressure (5D). The pneumatic brake control part (3) generates the pressure control signal (3D) based on a friction coefficient corresponding to the brake instruction (2D) and the initial velocity of the brake.

A device for control of a safety-relevant process is provided in the invention. For automated driving, safety precautions are necessary. The brake system is a redundant design including primary and secondary brake systems. Both brake systems safely decelerate the transportation vehicle and take over the function of the other brake system. The control of the safety-relevant process is based on theanalysis of the signals of at least one sensor (120); wherein for the brake process, it is a wheel rotation speed sensor. A hardware architecture and a test mode for the hardware architecture are provided. A communications bus (140) enables exchange of data between the primary and secondary control units. The at least one sensor of the hardware architecture connects to the primary control unit (110) and to the secondary control unit (130), wherein a respective sensor arrangement isolation circuit (116, 136) is associated with the primary control unit and the secondary control unit, which isolates the associated primary or secondary control unit from the at least one sensor (120).

A vehicle control system to control acceleration in line with the driver's intention when depressing one of an accelerator pedal and a brake pedal after releasing the other one of the pedals in one-pedal mode. The vehicle control system is configured to obtain an operating speed of one of an accelerator pedal and a brake pedal returned to an initial position, set a target acceleration based on an operating amount of the other pedal depressed after releasing said one of the pedals, and increase a correction amount to correct the target acceleration if the operating speed of the returned pedal is fast.

The invention relates to an air-drop system capable of achieving deplaning deceleration and posture stabilization. The air-drop system capable of achieving deplaning deceleration and posture stabilization comprises a cargo table and main parachutes. Main parachute ropes of the main parachutes are connected with the cargo table through a connecting rope. The main parachutes are placed in main parachute bags in a folded mode. The main parachute bags are also sequentially connected with an auxiliary guiding parachute and a traction parachute. The air-drop system capable of achieving deplaning deceleration and posture stabilization further comprises stabilization and deceleration parachutes. The stabilization and deceleration parachutes are placed in stabilization and deceleration parachute bags in a folded mode. Stabilization and deceleration parachute ropes of the stabilization and deceleration parachutes and the main parachute ropes are connected to the connecting rope in parallel. According to the air-drop system capable of achieving deplaning deceleration and posture stabilization, the deplaning rolling angle of the system can be reduced at the moment the air-drop system comes out of plane, so that hooking caused by an excessively-large rolling angle of the system is avoided; and in addition, the speed is decreased when the parachutes of the system are opened, and the probability of overload caused during opening of the main parachutes is lowered.

A method and apparatus for horizontally shifting an article group or article layer, composed of a plurality of articles, from a first position and / or from a conveying movement into a second rest position while largely maintaining the relative positions of the articles in the article layer or group to each other, said transfer being effected by at least one first pusher bar engaging with the articles located at the back of the article group or article layer, as considered in relation to the conveying or feed direction. A support bar, which is at least temporarily allocated to the articles located at the front of the article group or layer, as considered in relation to the conveying direction, moves ahead at a slight distance from or abuts on the foremost articles of the article group or layer at least immediately before or on reaching the rest position.

The invention discloses a control method, system and device for stable gear shifting of a hybrid electric vehicle. The hybrid electric vehicle comprises an engine, a motor and a double-clutch gearbox.The method comprises steps that when the vehicle is in a preset working condition, receiving a gear shifting request; obtaining a first output torque and a target output torque of the motor accordingto the gear shifting request; controlling the engine for being combined with the double-clutch gearbox, and unloading the output torque of the motor to zero from the first output torque; calculatinga first slope; controlling the output torque of the engine for being loaded from zero to the second output torque based on the first slope; controlling the output torque of the motor for being loadedfrom zero to the target output torque, moreover, controlling the output torque of the engine for being unloaded from the second output torque to zero based on the first slope. The method is advantagedin that the change of the output torque of the engine is controlled according to the change of the torque of the motor, the stable deceleration feeling of the whole vehicle is maintained, the acceleration fluctuation caused by torque loss during gear shifting is reduced, and smoothness during gear shifting is further improved.

The invention discloses a ropeway carriage speed control method. The method comprises an acceleration control process and a deceleration control process, wherein the acceleration control process comprises the steps of acquiring initial design speed, operation design speed and acceleration time, and controlling acceleration of a ropeway carriage, thereby completing the ropeway carriage acceleration control process; the deceleration control process comprises the steps of acquiring initial design speed, operation design speed, deceleration time and design distance, computing the deceleration distance of the ropeway carriage, and controlling deceleration of the ropeway carriage, thereby completing the ropeway carriage deceleration process. The ropeway carriage speed control method has the advantages that stable acceleration and deceleration of a ropeway carriage can be guaranteed, and impact, vibration and noise of linear acceleration and deceleration are avoided; deceleration points of a carriage can be computed, a sensor is omitted, and thus the cost is lowered; the method can be directly applied to a traditional ropeway control system, and no extra hardware investment is added; all control is performed by soft ware, and the defects of high fault rate and imprecise control of a traditional control method are avoided.

The embodiment of the invention discloses a curve vehicle speed control method and device, equipment and a medium. The method comprises the steps of when it is detected that the driving condition of a vehicle is the condition that the vehicle is about to drive into a curve, obtaining track point information of a driving track within the preset distance in front of the current position of the vehicle; determining a target speed limit value corresponding to each track point according to the road speed limit value and curvature corresponding to each track point and a preset lateral acceleration threshold value, and performing speed limit filtering on the target speed limit value corresponding to each track point; and in the running process of the vehicle, determining the current target vehicle speed of the vehicle according to the preset preview time and the target speed limit values corresponding to the filtered track points, and controlling the vehicle to run according to the current target vehicle speed of the vehicle until the running working condition of the vehicle is the working condition of driving out of the curve. According to the method of the invention, the vehicle can stably decelerate in advance when the vehicle is about to run to a curve with a relatively large curvature, and can safely pass through a curve section with a relatively large curvature at a low speed, so that the safety and comfort of the vehicle are improved.

A vehicle controller includes: a recognizer (121,122) configured to recognize a distance to a stop position as a first distance on the basis of an image captured by an imaging unit that images the front of a vehicle; and a braking distance estimator (123B) configured to estimate a braking distance to the stop position on the basis of the first distance recognized by the recognizer at a predetermined time point and a second distance acquired on the basis of a speed of the vehicle and to adjust a degree of reflection of the second distance in the braking distance on the basis of the first distance recognized by the recognizer after the predetermined time point.