33results about How to "Avoid acceleration and deceleration" patented technology

The invention provides a vehicle cooperative adaptive cruise control method based on a variable time interval strategy. Use radar, on-board sensors and V2V communication to determine the number of CACC vehicles that are continuous in front of the current vehicle and within its communication range, and use different variable time-distance strategies to determine the expected safe following distance according to the number of vehicles, and then determine the expected acceleration, so as to realize the vehicle control. The variable time distance of the present invention changes flexibly with the speed of the vehicle, the speed difference, and the acceleration of the vehicle in front, and can effectively balance the safety, car-following performance and road traffic capacity during driving, and can control the vehicle coordination Driving, improve road traffic flow, shorten travel time, and at the same time, the speed of the vehicle changes more smoothly during driving, which can improve driving comfort.

The invention discloses an urban expressway-oriented ramp merge control method, comprising the following steps: step 1, collecting relevant motion state information of vehicles in the main section of the expressway and incoming vehicles; step 2, constructing a ramp merge optimization control model; Step 3, optimize the movement state of the vehicles on the main road and incoming vehicles; Step 4, send the optimized vehicle control command to each vehicle, and each vehicle executes the control command; Step 5, in the next control cycle, return to continue to execute 1~4 step. The urban expressway-oriented ramp merge control method of the present invention avoids unnecessary acceleration and deceleration of main lanes and ramp merge vehicles, and effectively improves the safety, economy and efficiency of diverge and merge.

The invention discloses a laser machining method and device for cooperative motion of a laser galvanometer and an air blowing device. The method comprises the steps that a moving path of the laser galvanometer is planned; scanning machining is carried out by the laser galvanometer according to a planned moving path; the air blowing device moves cooperatively along with the laser galvanometer; andthe device comprises the laser galvanometer, the air blowing device and a driving device, wherein the laser galvanometer is arranged opposite to a laser source, the air blowing device is arranged below the laser galvanometer, and the driving device is used for moving the air blowing device. According to the method, through the optimized path and the mode of block machining on the path, the problemof matching between the high-speed mobility of the galvanometer and the motion of a motor platform is solved; and meanwhile, idle stroke waiting of the galvanometer redundancy is avoided, and the waiting time of the galvanometer idle stroke is reduced to the minimum, so under the condition that the machining efficiency is guaranteed, the influence of the heat effect on the machining effect in thelaser machining process can be reduced, the problem of shielding of a galvanometer light beam in the moving process of the air blowing device is avoided, and the quality of a laser machining workpiece is improved.

The invention provides a high-speed two-dimensional scanning mechanism. The high-speed two-dimensional scanning mechanism comprises a scanning mirror, a supporting frame, a first motor shaft, a first motor, a square framework, a second motor shaft, a second motor, a U-shaped frame, a third motor shaft and a third motor, wherein the scanning mirror is in rotary pair connection with the first motor by the supporting frame; the supporting frame is fixedly connected with the first motor shaft; the scanning mirror rotates along the normal direction of the scanning mirror under the driving of the first motor; the first motor is fixed on the square framework, and the square framework is in rotary pair connection with the U-shaped frame by the second motor shaft; the second motor shaft and the first motor shaft are vertical to each other and are on the same plane; the second motor is fixed on the U-shaped frame; the square framework and the scanning mirror rotate around the second motor shaft under the driving of the second motor; the U-shaped frame is in rotary pair connection with the third motor by the third motor shaft; the U-shaped frame is fixedly connected with the third motor shaft. According to the high-speed two-dimensional scanning mechanism, high-speed scanning of the scanning mechanism is easy to realize, so that real-time imaging of a terahertz imaging detection system and imaging detection of a moving target are facilitated.

The invention discloses a rail transit system capable of achieving circular transportation and belongs to the field of traffic systems. The rail transit system capable of achieving circular transportation comprises a main sliding rail module, a moving box body module, an entrance and exit module and a box body transfer module. The moving box body module circularly operates on the main sliding rail module, and the trajectory of circular movement is a closed loop in a horizontal plane. The box body transfer module is used for transferring the moving box body module between the entrance and exit module and the main sliding rail module. According to the rail transit system capable of achieving circular transportation, first sliding blocks always move on a main sliding rail at constant speed, so that the acceleration and deceleration process is avoided, energy is saved, waiting time is further saved for passengers, and passengers can arrive at appointed stations conveniently and rapidly.

The invention provides a control method and device for following running of an automatic driving vehicle. The control method comprises the steps that the instantaneous speed of a front vehicle, the instantaneous speed of a vehicle and the actual relative distance between the vehicle and the front vehicle are obtained; the instantaneous acceleration of the front vehicle is obtained, and the drivingstate of the front vehicle is judged according to the instantaneous acceleration of the front vehicle; the expected relative distance between the vehicle and the front vehicle is calculated accordingto the driving state of the front vehicle and the instantaneous speed of the front vehicle; the expected acceleration of the vehicle is calculated according to the parameters; and the vehicle is controlled to travel at the expected acceleration of the vehicle. According to the invention, the acceleration of the front vehicle is judged; according to the method, the driving state of the front vehicle is determined, different parameter values are set for the same parameter according to different driving states of the front vehicle to calculate the expected acceleration of the vehicle, the vehicle is controlled to run according to the expected acceleration of the vehicle, and the problems of vehicle following safety and poor passenger experience under the conditions of overtaking or emergencybraking and the like in the prior art are solved.

The invention discloses a small self-adapting wire drawing machine with a variable disk diameter, which comprises multi-stage diameter-reducing wire drawing dies and multi-stage traction wheels, wherein each traction wheel is arranged between every two diameter-reducing dies; an annular groove is formed at the outer edge of each traction wheel; a plurality of pulleys and take-up pulleys are arranged behind the last-stage traction wheel; two brackets are arranged between two pulleys; a gap is formed between two brackets; each bracket is provided with a strip-shaped sliding groove; a wire passing wheel is positioned in the gap between two brackets; the central axis of each wire passing wheel slides up and down in each strip-shaped sliding groove; an annular groove is formed at the outer edge of each wire passing wheel; a swinging rod seat is installed at one side of each bracket; a tension swinging rod is installed on each swinging rod seat through a rotation axis with a torsion spring;a rolling wheel is installed at the front end of each tension swinging rod; each rolling wheel is butted below the outer edge of each wire passing wheel; and an angle sensor is installed at the rotating connection point of each tension swinging rod and each rotation axis to sense the rotation angle of each tension swinging rod. The small self-adapting wire drawing machine with variable disk diameters overcomes the defects of prior wire drawing machines, ensures the consistency of the winding diameter of real-time computation and the practical winding diameter, completely solves the problems of slow response of the large winding diameter and oscillation of the small winding diameter, shortens the production cycle and saves the cost.

The invention provides a large-view-field rapid two-dimensional scanning mirror mounting structure. The large-view-field rapid two-dimensional scanning mirror mounting structure comprises upper and lower pitching driving motors which are symmetrical relative to a long axis of a scanning mirror at a zero position, wherein the two pitching driving motors drive the scanning mirror to scan in a pitching direction by the movement with the same speed and opposite directions; the large-view-field rapid two-dimensional scanning mirror mounting structure further comprises an azimuth driving motor, an angle sensor and two linear displacement sensors; the azimuth driving motor is used for driving a crank connection rod mechanism so as to drive the scanning mirror to scan in an azimuth direction; the angle sensor is used for realizing the measurement of a pitching angle of the scanning mirror; the two linear displacement sensors are used for differentially measuring linear displacement when a pitching shaft supporting frame rotates and indirectly measuring an azimuth rotary angle of the scanning mirror. Compared with an existing two-dimensional scanning machine structure, large-view-field scanning can be realized while high-speed scanning is realized, so that a terahertz imaging detection system is practical to the application to public place safety inspection.

The invention discloses a lifting method of a continuous elevating circulating elevator system and belongs to the field of elevators. According to the lifting method of a continuous elevating circulating elevator system, when gong upstairs function is required, the method comprises following steps: passengers enter in an inlet cabinet; the passengers enters in a passenger-carrying car; a target first slide block is searched; a car on the target first slide block is parked at a floor where the passengers are located; the passenger-carrying car is transferred to the target first slide block; the passenger-carrying car is parked at the rear of an elevator outlet door of a target floor; the passenger-carrying car is transferred to the rear of a second elevator inlet door corresponding to a gateway module. According to the method, the first slide block always moves uniformly on the hoistway, thus avoiding acceleration and deceleration, not only saving energy but also saving waiting time for passengers, so that passengers can quickly and easily reach the designated floors.

The invention belongs to the field of radar signal processing technology and synthetic aperture radar imaging technology, in particular to a cylindrical spiral scanning imaging method and system in the terahertz frequency band. The method includes the steps of: a radar platform equipped with a terahertz radar moves along the trajectory of a cylindrical helix, and during the movement of the radar platform, the line of sight of the terahertz radar always points to the center of the scene area, sends signals, and collects echo signals for imaging . The system executes the steps of the terahertz frequency band cylindrical helical scanning imaging method. The cylindrical spiral scanning mode adopted by the method of the invention avoids the acceleration and deceleration process of the existing linear scanning mode, and is beneficial to realize real-time imaging. Due to the stability and central symmetry of the cylindrical rotation scan, the imaging process can be started from any moment in the rotation process, not limited to the same starting point and the same end point. The imaging system of the invention can effectively reduce the number of array elements and reduce the system cost under the premise of ensuring high imaging resolution.

A work conveying device holding a work by using a prescribed holding means between press devices where molds are driven and conveying the work. The work conveying device comprises a conveyance control means controlling the position of the holding means based on a target synthetic value obtained by synthesizing the mold position of the press device positioned on the upstream side in a work conveying direction (upstream side mold position) and the mold position of the press device positioned on the downstream side (downstream side mold position). The conveyance control means can suppress the vibration of the work conveying device in a press line by adopting a means for setting the target synthetic value so that the holding means can be smoothly moved.