40 results about "Slip coefficient" patented technology

The invention discloses a method for controlling the traction of an electric vehicle. A motor is driven by one controller; and the controller is internally provided with a finished vehicle status gain calculator, a vector controller, an error observer and an optimal slip ratio tracker. When a system operates, the finished vehicle status gain calculator analyzes the intention of a driver according to initialized vehicle information and real-time read finished vehicle status information and determines a torque gain curve, a vehicle acceleration curve and a vehicle desired speed; then the vector controller controls the motor to be up to a preset torque; next, the error observer compares the error between an actual value and a calculated value of the speed and adjusts a road condition resistance coefficient; and the optimal slip ratio tracker calculates the real-time slip ratio of the vehicle and adjusts a slip coefficient in a torque equation according to the calculated value so that the vehicle keeps in an optimal slip ratio state. By using the method, the phenomenon of slip is effectively prevented, and the acceleration performance and the side stability of the electric vehicle are improved.

The invention discloses a speed cooperative control method for a heavy and medium plate mill and conical roller beds and relates to the technical field of metal pressure working. The speed cooperative control method for the heavy and medium plate mill and the conical roller beds includes the following steps that according to a roller bed rolling parameter of a plate, a forward slip coefficient in a plate rolling process is calculated, and the roller bed rolling parameter is obtained from a rolling mill two-stage process model set system; speeds of the plate rolled in the roller bed at the inlet position and the outlet position of a rolling mill are calculated through the rotating speed of a roller of the rolling mill and the obtained forward slip coefficient; the rotating speeds of the rolling mill at the inlet and the outlet conical roller beds are calculated respectively according to the inlet speed and the outlet speed of the plate, the width of the plate and the geometrical shape parameters of the conical roller beds, the calculated rotating speed values are sent to a roller bed motor transmission system for execution, and therefore speed setting is conducted respectively for the front and the rear conical roller beds of the rolling mill. The speed cooperative control method for the heavy and medium plate mill and the conical roller beds solves the problems that the contact portion of the plate and the conical roller beds is poor in linear speed, and the surface quality of the plate and the service life of the roller beds are seriously affected.

The invention discloses a method for processing silk threads through a two-for-one twister. The method for processing the silk threads through the two-for-one twister comprises the following steps that firstly, according to the actually measured twist of finished product sample fabric silk threads and the raw material variety of the silk threads, the twist of gray fabric silk threads is calculated; secondly, the twist of the non-steamed silk threads is obtained according to the twist of the gray fabric silk threads and the raw material variety of the silk threads; finally, according to the twist of the non-steamed silk threads and the spindle tape slip coefficient of the two-for-one twister, the design twist of the two-for-one twister is calculated, and the two-for-one twister is adjustedaccording to the design twist to conduct two-for-one twisting processing. According to the method, the steam shrinkage rate and the printing and dyeing shrinkage rate of the silk threads and the spindle tape slip coefficient of the two-for-one twister are considered, and the design twist of the two-for-one twister is calculated; processing is carried out according to the design twist, the twist ofa manufactured finished product fabric is consistent with that of a finished product sample fabric, and the requirements of clients or design are well met.

The invention relates to a method for shifting gears of a transmission (1) of a motor vehicle, said transmission having an input side (11, 21, 31, 41) and an output side (13, 23, 33, 43) respectively At least two friction-locking shifting devices (10, 20, 30, 40), wherein the rotational speed of the input side (11, 21, 31, 41) and the rotational speed of the output side (11, 21, 31, 41 ) between each other defines a slip coefficient (S), and wherein each of said shifting devices (10, 20, 30, 40) has at least one power shift state in which the input side (11, 21, 31, 41) and output side (13, 23, 33, 43) are interconnected to transmit torque; and an idle shift state in which the input side (11, 21, 31, 41) and output sides (11, 21, 31, 41) are substantially disconnected from each other, and wherein a first of said shifting devices (10) is switched from its power shifting state to its idle shifting state, or reverse shifting, and the second shifting device in the shifting device (20) is shifted from its idle shifting state to its power shifting state according to its slip coefficient (S20) in the following cases state, or reverse shifting, that is, when the slip coefficient (S20) after zero crossing, especially in the sense of slip reversal, has a different Another symbol in between.