32results about How to "Avoid acceleration and deceleration" patented technology

The invention provides a vehicle cooperative adaptive cruise control method based on a variable time gap and interval strategy. A radar, a vehicle-mounted sensor and V2V (Vehicle-to-Vehicle) communication are used for determining a number of successive CACC (Cooperative Adaptive Cruise Control) vehicles which are in front of a current vehicle and are within a communication range of the current vehicle, and according to the number of the vehicles, different variable time gap strategies are adopted to determine an expected safe vehicle following interval, expected acceleration is then determined, and therefore, vehicle control is realized. The variable time gap of the invention flexibly changes along with the change of the speed of the current vehicle, a speed difference and the accelerationof a front vehicle, safety, vehicle following properties and a road traffic capacity in a driving process can be effectively balanced, in addition, vehicle cooperative driving can be controlled, a road traffic flow is improved, and journey time is shortened. Meanwhile, a vehicle speed change in the driving process is stable, and driving comfort can be improved.

The invention discloses a ramp confluence control method for an urban expressway. The ramp confluence control method comprises the following steps: 1, collecting related motion state information of vehicles on a main road section of the whole expressway and afflux vehicles; 2, constructing a ramp confluence optimization control model; 3, optimizing the motion states of the vehicles on the main road and the afflux vehicles; 4, sending an optimized vehicle control instruction to each vehicle, and executing the control instruction by each vehicle; and 5, in the next control period, returning to continuously execute the steps 1-4. According to the ramp confluence control method for the urban expressway, unnecessary acceleration and deceleration of the main lane and ramp confluence vehicles areavoided, and the safety, economy and efficiency of diversion and confluence are effectively improved.

The invention belongs to the technical field of radar signal processing and synthetic aperture radar imaging, and particularly relates to a terahertz frequency band cylindrical spiral scanning imagingmethod and system. The method comprises the steps that a radar platform carrying a terahertz radar moves along the track of a cylindrical spiral line, in the moving process of the radar platform, thesight direction of the terahertz radar points to the center of a scene area all the time, signals are sent, and echo signals are collected for imaging. The system executes the steps of the terahertzfrequency band cylindrical spiral scanning imaging method. According to the method, a cylindrical spiral scanning mode is adopted, the acceleration and deceleration process of an existing linear scanning mode is avoided, and real-time imaging can be achieved. Due to the stability and the central symmetry of cylinder rotation scanning, imaging processing can be started from any moment of the rotation process and is not limited to the same starting point and the same terminal point. According to the imaging system, the number of array elements can be effectively reduced on the premise of ensuring high imaging resolution, and the system cost is reduced.

The invention discloses a braking energy recovery method, a braking energy recovery device and a vehicle. The braking energy recovery method comprises the steps of obtaining obstacle information in front of a vehicle and vehicle state information, and the vehicle state information comprising the accelerator pedal state and the speed of the vehicle; determining the braking intention of a driver according to the obstacle information and the accelerator pedal state; distributing hydraulic braking force and/or motor braking force according to the braking intention, the obstacle information and thespeed of the vehicle; and acquiring the current residual electric quantity information of a battery, and recovering the braking energy according to the residual electric quantity information and thedistribution result of the hydraulic braking force and the motor braking force. According to the braking energy recovery method, the braking energy recovery device and the vehicle, the braking energyrecovery efficiency is improved.

The present invention provides a workpiece conveying device that uses a predetermined gripping mechanism to hold and convey the workpiece between punching devices that drive molds respectively, and has a conveying control mechanism that is based on a combination of punches located upstream in the conveying direction of the workpiece. The position of the above-mentioned gripping mechanism is controlled by a combined target value obtained by combining the die position of the device, that is, the position of the upstream side die, and the position of the die of the punching device on the downstream side, that is, the position of the downstream side die. The gripping mechanism moves smoothly, thereby suppressing the vibration of the workpiece conveying device in the press line.

The invention discloses a volumetric three-dimensional display device and method based on circumferential screen scanning, the device comprises a high speed projection device, a screen turning transmitting device, a screen group, a rotating speed detection device, a central control module and a PC, and the screen group comprises a plurality of screens which are fixedly arranged on the screen turning transmitting device. According to the invention, a screen moves in an imaging space at uniform speed in one direction from beginning to end, imaging complexity is greatly reduced, large depth of field can be realized, compared with reciprocating type screen translation scanning, unidirectional rotation type screen scanning has no acceleration and deceleration process, scanning rate is easily to improve, voxel quantity of three-dimensional imaging is greatly increased, so that three-dimensional imaging resolution is improved, acceleration and deceleration of reciprocating motion are avoided, vibration and loss of hardware and structure portion of the device are reduced, and service life of the device is prolonged.

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 relates to a hybrid power assembly control system special for an automated guided vehicle. The hybrid power assembly control system comprises a driving unit, an electric generating unit,a power supply module and a main control unit; the driving unit is connected with the power supply module and the main control unit, and according to driving control signals output by the main control unit, the guided vehicle is driven to operate and rotate; the electric generating unit is connected with the power supplying module and the main control unit, and an alternating current is generatedand converted into a direct current to be output; according to electric generating control signals output by the main control unit, the electric generating unit works within a preset range of the fuel efficiency; the power supply module is connected with the main control unit, and according to power supply distributing control signals output by the main control unit, corresponding electric energyis output to the driving unit; and electric quantity information of the power supply module is further obtained by the main control unit in real time, and according to the obtained electric quantityinformation, the electric generating control signals are output to control the electric generating unit to work within the preset range of the fuel efficiency. According to the scheme, the working efficiency of the automated guided vehicle is high, and back-and-forth mechanical braking can be avoided.

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 relates to a smoothing method for a Cartesian space motion trail of a six-axis series industrial robot. The smoothing method comprises the following steps that a transition path between any two adjacent given motion paths is constructed by using a cubic quasi-uniform spline curve, and an actual transition radius is determined according to the lengths of the two given motion paths and a given transition radius; the position of a starting point of the transition path and the position of an ending point of the transition path are obtained according to the actual transition radius, and the position of a control point of a spline curve serving as the transition path is solved to construct a proper transition path; seven-section S-shaped speed planning is carried out to obtain a function relation between the path length and time, and finally isochronous interpolation is carried out according to the function relation between the path length and time to obtain an actual position of an interpolation point; and then the rotation angle of each joint of the six-axis series industrial robot is obtained through inverse kinematics to drive the six-axis series industrial robot to rotate continuously, so as to obtain a smooth motion trail, and meet the process requirements of actual production.

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.