A fast and high-precision loading control method for dynamic load spectrum

Abstract

The invention discloses a fast and high-precision loading control method for a dynamic load spectrum. The method comprises constructing an n-order B-spline primary function; performing iterative learning for each of n+1 primary functions in the n-order B-spline primary functions to obtain n+1 primary functions and their corresponding control quantities to form the primary function control library;enabling each start point and each end point of the load spectrum to repeat 3 times to form a new load spectrum; performing segmented rolling fitting on the new load spectrum by using the primary functions in the primary function control library and their control quantities to obtain the control quantity u of each segment and its corresponding time t; and outputting the calculated control quantity u to a frequency converter according to the corresponding time t so as to instruct an AC asynchronous variable-frequency motor to generate a corresponding loading torque. The method of the present invention can improve the torque loading accuracy of the AC asynchronous variable-frequency motor and improves the correspondence between the applied load and time.

Description

technical field [0001] The invention relates to the technical field of loading control, in particular to a fast and high-precision loading control method of a dynamic load spectrum. Background technique [0002] When testing equipment such as engines, gearboxes, and complete vehicles, in order to better simulate their actual operating conditions, it is often necessary to apply a certain load spectrum to them. The load spectrum refers to the change law of the load on the output shaft of the measured object with the running time of the measured object. [0003] A commonly used load spectrum simulation method is the AC power dynamometer loading method. The basic principle is to connect the rotating shaft of the AC asynchronous variable frequency motor with the output shaft of the tested object, the measured object drives the AC motor to rotate, the AC asynchronous variable frequency motor is controlled by the frequency converter, and the frequency converter works in the torque...

AI Technical Summary

Problems solved by technology

During the loading process, the load applied to the output shaft of the measured object is required to be strictly corresponding to the time, and the conventional closed-loop feedback control algorithm generally has a time lag, and it is difficult to achieve such a high real-time performance

Images