Continuous continuation method for closed-loop control parameters of accelerator motor control system

Abstract

The invention discloses an accelerator motor control system closed-loop control parameter continuous continuation method, which comprises the following steps: based on an incremental PID closed-loop control algorithm, introducing a novel B-spline basis function, firstly, selecting representative valve opening and closing angles as typical nodes according to output characteristics of different motor control systems or different applications, and carrying out continuous continuation on the valve opening and closing angles; a plurality of corresponding discrete PID control parameters are obtained through a transfer function model and output error control of an accelerator motor control system, the PID control parameter is the PID control parameter of the ith node, a piecewise continuous PID function is obtained through a novel B-spline basis function, then the range interval of the typical working condition where the current working condition of the control system is located is determined, and the current working condition of the control system is determined. And determining the position of the function and obtaining corresponding closed-loop control P, I and D parameters so as to accurately control any working condition of the stepping motor. According to the method, the problem of low control precision caused by simplification of PID control parameters of a traditional accelerator motor stepping motor control system under all working conditions is effectively solved, and the accuracy and efficiency of PID control parameter fitting shape and curvature adjustment are improved.

Description

technical field [0001] The invention relates to the field of throttle motor control systems, in particular to a continuous extension method for closed-loop control parameters of a throttle motor control system. Background technique [0002] The throttle motor control system uses a high-torque stepper motor to precisely control the corresponding stroke of the fuel injection valve according to the opening and closing of the throttle. In order to improve the control accuracy, the closed-loop control algorithm based on incremental PID has been widely used in the field of stepper motor control. In conventional applications, PID control parameters in the field of stepper motor control are generally set comprehensively through experiments and theoretical models, and unique parameters are used for all operating conditions. In fact, since the stepper motor control system model exhibits obvious nonlinear characteristics under different operating conditions such as rotational speed, d...

AI Technical Summary

Problems solved by technology

The traditional B-spline basis function is fixed, and the shape of the fitted curve and surface is fixed, which cannot take into account the overall and local characteristics

In order to solve this problem, parametric B-spline function is applied to the field of discrete data fitting, but too many adjustment parameters will bring a series of problems: the correlation between parameters increases, which is not conducive to the accuracy and efficiency of shape and curvature adjustment ; The increase in the complexity of parameter adjustment leads to an increase in the complexity of the algorithm and an increase in the computational burden of the controller; at the same time, it will also cause the design complexity and cost of the closed-loop control system to increase and the system reliability to decrease.

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