20 results about "Brake response time" patented technology

The invention provides an anti-pinch control method, device and system for an electric tail door and a vehicle, and relates to the technical field of vehicle control. The method comprises the following steps: receiving radar original point cloud data generated by a millimeter wave radar sensor in an obstacle sensing module; receiving tail gate motion data sensed by a tail gate motion sensor in the electric tail gate actuating mechanism; filtering the radar original point cloud data to generate preprocessed data; obstacle identification and classification are carried out on the preprocessed data through an obstacle identification and classification model, and the obstacle type is determined; determining the position, motion data and distance of the obstacle according to the preprocessed data; determining a critical distance according to the movement data of the obstacle, the movement data of the tail gate and predefined braking response time; according to the obstacle type, the obstacle distance and the critical distance, an anti-pinch control instruction is determined; and an anti-pinch control instruction is sent to an electric tail gate executing mechanism. The anti-pinch control sensitivity is improved, and the safety is improved.

The invention provides a pneumatic valve device, a pneumatic brake system and a commercial vehicle. The pneumatic valve device comprises a first air pressure port used for receiving air source pressure of a lower pressure value; the second air pressure port is used for transmitting trailer braking pressure; the third air pressure port is used for outputting trailer brake control air pressure; the first air pressure port is connected with the third air pressure port through a working cavity of the relay valve; the fourth air pressure port is used for receiving the air source pressure with the higher pressure value; the control end of the energy supply valve is connected with the first air pressure port, an air inlet of the energy supply valve is connected with the fourth air pressure port, an air outlet of the energy supply valve is connected with the second air pressure port, the energy supply valve is constructed to make the air inlet and the air outlet communicated when the pressure of the control end of the energy supply valve is larger than an opening threshold value, and the opening threshold value is smaller than the first pressure value. The air source pressure with the higher pressure value can be introduced into the trailer braking system, the energy storage capacity of the trailer braking system is improved, the trailer braking response time can be shortened, and the whole vehicle braking efficiency is improved.

The utility model discloses a centralized electric drive bridge and vehicle, wherein, the centralized electric drive bridge includes axle, motor, first brake component and first speed reducer, and motor, first brake component and first speed reducer are integrated in the radial side of axle, and first brake component exports the braking force to axle through locking the input end or output end of first speed reducer, the utility model discloses the centralized electric drive bridge of the present application, by integrating motor, first brake component and first speed reducer in the radial side of axle, form compact power module, reduce the space occupation, through the input end or output end of locking first speed reducer of first brake component, compared with prior art, can significantly prolong the service life of motor, and, shorten the brake force transmission chain, improve the brake response time, can greatly improve the heavy load, heavy -duty vehicle ramp parking and emergency brake safety.

The invention relates to an elevator safety clamp braking response time testing device and a testing method thereof, belongs to the technical field of elevator accessory detection, and aims to solve the problems that the initial state of an existing testing device is difficult to control and no failure protection exists. A baffle of the bearing part horizontally slides to bear and release the test plate, a bilateral synchronous power assembly drives the baffle to reduce lateral disturbance when the test plate is released, a protection part comprising a buffer plate and a buffer assembly is arranged, and the buffer assembly is matched with a compression spring through an inclined sliding hole to convert vertical impact into buffer resistance. According to the device, initial test conditions are accurately controlled, failure protection is provided, test repeatability and safety are improved, and the device is suitable for the field of elevator accessory detection and the like.

The present application relates to the field of rail vehicle braking technology, and discloses a power actuation control method in rail vehicle braking, comprising: collecting a stator current sequence of a braking torque generation unit, calculating a first-order forward difference value to identify a load stiffness jump characteristic and determine a brake shoe contact position, locking the current effective value corresponding to the brake shoe contact position as a clamping current reference, adjusting the output torque compensation mechanism gap in response to the brake shoe contact position, and locking the integral path in the anti-slip adjustment unloading stage to maintain the stator current at the clamping current reference, wherein the present application uses electromagnetic parameter surface layer mutation to accurately offset the transmission gap of the mechanism, realizes physical quasi-synchronization of the electric command and mechanical action, suppresses the mechanism rollback phenomenon in the anti-slip stage, guarantees the real-time performance of the braking force reconstruction, and shortens the braking response time.

The application provides a safety risk early warning method and system based on brake performance evaluation, belonging to the field of vehicle brake performance evaluation and safety technology, and the method comprises the following steps: acquiring brake system operation data, vehicle motion state data, environment perception data and external scene data of a vehicle; calculating a current brake performance evaluation index based on the brake system operation data and the vehicle motion state data; the current brake performance evaluation index comprises a brake response time, a brake distance and a brake stability index; performing feature fusion processing on the brake response time, the brake distance and the brake stability index to obtain a brake performance feature vector; in response to any current brake performance evaluation index being less than a corresponding preset performance index threshold, calculating a safety risk level based on the brake performance feature vector, the environment perception data and the external scene data through a safety risk model; and executing a corresponding risk early warning strategy according to the safety risk level.

This utility model relates to the field of safety engineering and emergency protection technology, and discloses an insulated lifting platform for live-line work on high-voltage transmission lines. It includes a chassis, a compression mechanism on the top center of the chassis, lifting rods fixedly connected to the left and right sides of the top of the chassis, a platform fixedly connected to an adjacent side of the two lifting rods, a protective mechanism on the top of the platform, two buffer blocks fixedly connected to the top of the chassis at their bottoms, and multiple Z-shaped rods fixedly connected to the top of the lifting rods at their bottoms. The left and right sides of the platform are slidably connected to adjacent sides of the two lifting rods. In this utility model, the air inside the telescopic column is rapidly compressed into the air compressor, causing adsorption blocks one and two to quickly adhere to the outer wall of the lifting rods. The pneumatic force rapidly triggers braking, significantly shortening the braking response time and improving platform safety.

This invention provides a method, device, system, and vehicle for anti-pinch control of an electric tailgate, relating to the field of vehicle control technology. The method includes: receiving raw radar point cloud data generated by a millimeter-wave radar sensor in an obstacle sensing module; receiving tailgate motion data sensed by a tailgate motion sensor in an electric tailgate actuator; filtering the raw radar point cloud data to generate preprocessed data; identifying and classifying obstacles in the preprocessed data using an obstacle recognition and classification model to determine the obstacle type; determining the position, motion data, and distance of the obstacle based on the preprocessed data; determining a critical distance based on the obstacle's motion data, tailgate motion data, and a predefined braking response time; determining an anti-pinch control command based on the obstacle type, obstacle distance, and critical distance; and sending the anti-pinch control command to the electric tailgate actuator. This invention improves the sensitivity of anti-pinch control and enhances safety.

The invention provides a safety risk early warning method and system based on brake performance evaluation, and belongs to the technical field of vehicle brake performance evaluation and safety, and the method comprises the steps: obtaining brake system operation data, vehicle motion state data, environment perception data and external scene data of a vehicle; calculating a current braking performance evaluation index based on the braking system operation data and the vehicle motion state data; the current brake performance evaluation indexes comprise brake response time, brake distance and a brake stability index; performing feature fusion processing on the braking response time, the braking distance and the braking stability index to obtain a braking performance feature vector; in response to the fact that any current brake performance evaluation index is smaller than a corresponding preset performance index threshold value, calculating a safety risk level through a safety risk model based on the brake performance feature vector, the environment perception data and the external scene data; and executing a corresponding risk early warning strategy according to the security risk level.

The invention discloses a test bench and a test method for brake response time of an EMB assembly, and the test bench comprises a caliper which is provided with a filler block, the caliper can drive the filler block to move, and the filler block can move to be close to a brake disc so as to clamp the brake disc; the interior of the environment bin is used for providing environment simulation conditions required by testing for the calipers; the fixing tool is arranged in the environment bin, and the fixing tool is used for installing and fixing calipers; the vibration mechanism is used for driving the fixing tool to vibrate so as to drive the calipers to vibrate; the detection mechanism comprises a plurality of force sensors, the plurality of force sensors are arranged between the contact parts of the calipers and the filler block, and when the brake disc is clamped by the filler block, the force sensors can detect the pressure of the calipers acting on the filler block. The brake response time can be accurately calculated, and the reliability and authenticity of the test are improved.

The invention is suitable for the technical field of rail transit fault detection, and provides a rail transit fault detection device for municipal planning, which comprises a vehicle state detection module for constructing a vehicle state evaluation model according to a current gearbox temperature characteristic value, a wheel vibration characteristic value and a vehicle abnormal sound characteristic value, and outputting a vehicle state index; the track state detection module is used for constructing a track state evaluation model according to the current track irregularity, the track gauge dynamic offset and the track surface wave grinding depth, and outputting a track state index; and the traffic fault risk assessment module is used for constructing a traffic fault risk assessment model according to the vehicle running speed, the vehicle state index, the track state index and the basic braking response time under the influence of the external wind power intensity. According to the device, comprehensive assessment of potential fault risks is realized by integrating comprehensive data of vehicles, rails, traffic operation and a contact network and fully considering the coupling influence of external environmental factors.

The application discloses a hydraulic brake circuit control system and a telescopic arm forklift. The hydraulic brake circuit control system comprises a service brake circuit, a vehicle axle brake, a service brake valve and a flow regulating valve. A working oil port on one side of the service brake valve is connected with the vehicle axle brake through a service brake working oil path to control the liquid filling or discharging of the vehicle axle brake. The hydraulic pump is connected with an oil inlet on the other side of the service brake valve through a first pumping oil path, and the flow regulating valve is arranged in the first pumping oil path to regulate the flow of the liquid filling or discharging of the vehicle axle brake. The application cancels the traditional liquid filling valve and liquid filling circuit, directly supplies brake oil to the service brake circuit through the hydraulic pump, fully supplies the brake oil liquid, has a quick response, and simplifies the whole brake system. For vehicle axle brakes of different specifications and sizes, the flow regulating valve can regulate the flow, thereby regulating the service brake response time, and the generality is better.

The invention provides a drive-by-wire dynamic clearance self-adaptive adjustment method and device, electronic equipment and a medium, and relates to the field of drive-by-wire chassis brake control. When the vehicle running state parameters meet the configured safety conditions, a motor is controlled to drive a transmission mechanism to push a piston to move according to a preset stroke, and the real-time torque of the motor is obtained after the preset stopping duration is maintained; if the real-time torque is not smaller than the preset torque threshold value, the current position of the corresponding piston is determined; based on the current position of the piston and the configured reserved gap, the target initial position of the piston is determined; and based on the initial position of the piston and the target initial position, the total movement stroke needed by the piston during braking is determined. The contact position of the friction plate and the brake disc is recognized in a self-adaptive mode, gap increase caused by abrasion is dynamically compensated, the total stroke of piston movement during braking is stabilized, the situation that the braking response time is prolonged is effectively avoided, and the driving safety and the braking reliability are improved.

The utility model relates to the technical field of vehicle brake systems, and discloses a novel wedge-shaped brake pressure plate assembly which comprises an upper brake pressure plate, a lower brake pressure plate and a wedge-shaped pull rod, the upper brake pressure plate and the lower brake pressure plate are detachably connected, one side of the upper brake pressure plate is integrally provided with a first transmission head, one side of the lower brake pressure plate is integrally provided with a second transmission head, and the wedge-shaped pull rod is connected with the first transmission head. The first transmission head and the second transmission head are arc-shaped transmission heads and are oppositely arranged, a wedge-shaped pull head is arranged at one end of the wedge-shaped pull rod, and the wedge-shaped pull head is located in a space formed by the first transmission head and the second transmission head. The overall structure integration degree is increased, the transmission efficiency is improved, the braking response time is shortened, and the maintenance cost is reduced.

The invention relates to the technical field of vehicle braking, in particular to an electronic mechanical braking system. The invention provides an electronic mechanical braking system which comprises a power source, a braking control assembly, a bridge control module and a plurality of wheel end modules. The power source is connected with the bridge control module. The brake control assembly is connected with the bridge control module and used for sending a brake instruction to the bridge control module. The bridge control module is electrically connected with the wheel end module and used for controlling the wheel end module to brake the clamp according to the received brake instruction, and multiple brake modes are achieved. According to the electronic mechanical braking system, electric signal transmission is adopted in the whole process from an instruction to an actuator, the problems of complexity and weight of a traditional electric pneumatic braking system are solved, the problem of long braking response time is solved, and multiple braking modes such as traveling braking, parking braking, emergency braking, emergency braking and holding braking are achieved.

The invention provides a vehicle emergency braking control method and system and electronic equipment, and relates to the field of vehicle-mounted braking control, according to the method, an emergency degree parameter is added in an emergency braking message of a vehicle, and a braking system can respond to different braking strategies according to the parameter, so that fine control response to the braking process of the vehicle is achieved, and the service life of the vehicle is prolonged. The energy recycling rate is increased, the braking response time can be remarkably shortened, and comfort is considered.

The application provides an off-road environment terrain adaptive speed planning method and device, equipment and medium, and belongs to the technical field of automatic driving vehicle decision planning. The method comprises the following steps: performing coordinate conversion on the speed, acceleration and impact degree of a target vehicle to obtain a vehicle motion component; determining a speed optimization model based on the vehicle motion component, global path data and a vehicle critical speed model, and solving the speed optimization model to obtain a global optimal speed curve; calculating a dynamic safety distance through a safety distance model based on road condition data, a road influence factor, a vehicle and obstacle motion state, a braking response time and a safe parking distance; obtaining an occupancy S-T graph based on the global path data and a dynamic obstacle prediction trajectory; and determining a multi-objective cost function based on the occupancy S-T graph, the dynamic safety distance and the global optimal speed curve, and solving the multi-objective cost function to obtain a dynamic obstacle avoidance optimal speed curve. The application can meet the requirements of vehicle dynamics stability constraint and dynamic obstacle safety avoidance in an off-road environment.

The invention provides an anti-falling device of semiconductor storage equipment and lifting equipment. The anti-falling device comprises a fixed toothed plate and an anti-falling mechanism installed on the transmission belt, the fixed toothed plate is parallel to the transmission belt, and the tooth surface of the fixed toothed plate faces the anti-falling mechanism. The anti-falling mechanism comprises a mounting seat, an elastic piece, a movable plate and a fixed rod, the mounting seat is fixedly arranged on the transmission belt, and the elastic piece is in a compressed state through the tension of the transmission belt; the movable plate is elastically connected with the mounting seat through the elastic piece, and the fixed rod is in a non-locking state; and when the elastic piece releases the elastic potential energy, the movable plate acts on the fixed rod, so that the locking end of the fixed rod rotates and is clamped into the fixed toothed plate, and mechanical locking is formed. The mechanism replaces a double-belt redundant structure, a transmission system is simplified, the cost is reduced, the braking response time is shortened, and the reliability of emergency braking and falling prevention is improved.

The utility model provides a wet brake hub reduction gear and a mining dump truck, and belongs to the technical field of dump truck transmission. According to the technical scheme, the wet brake hub reduction gear comprises a reduction gear body, the reduction gear body comprises a power source mechanism and a brake mechanism, the output end of the power source mechanism is in transmission connection with a second end, the brake mechanism comprises a second output shaft, a reduction module and a wet brake, and the second output shaft is provided with a third end and a fourth end which are opposite. The speed reduction module comprises a first input end and a first output end, the first input end is in transmission connection with the fourth end, the speed reduction module is at least used for reducing the speed of power transmitted by the second output shaft, and the wet brake is connected with the first output end in a matched mode for braking. The wet brake is arranged at the rear end of the power source mechanism, the braking path of the wet brake is reduced, the braking response time is prolonged, the speed reduction module is arranged at the front end of the wet brake, and the braking effect is improved.

The utility model discloses an electronic power-assisted brake transmission rack which comprises a transmission rack body, a hollow structure, a transmission tooth and a wear-resistant block, the hollow structure is arranged in the transmission rack body and penetrates through the transmission rack body, a weight reduction cavity is formed in the transmission rack body, grinding lines are arranged on the tooth surface of the transmission tooth, and the wear-resistant block is arranged on the transmission tooth. A groove body is formed in the back of the transmission rack body, and a wear-resisting block is embedded in the groove body. The weight of the rack is greatly reduced due to the hollow structure, and the energy consumption of the whole vehicle is reduced. The wear-resistant block is embedded in a groove body in the back of the rack and is made of a high-hardness composite material, so that the wear resistance is improved, and the meshing noise is reduced. And the transmission efficiency is high, and the brake response time is shortened due to the involute tooth profile design. And the modular design is suitable for various braking systems, and the installation efficiency is improved. In conclusion, the utility model provides the electronic power-assisted brake transmission rack which has the advantages of light weight, high wear resistance, low noise and high transmission efficiency.