Self-adaptive control algorithm of pointer of stepper motor type motormeter

Abstract

The invention discloses a self-adaptive control algorithm of a pointer of a stepper motor type motormeter. According to the self-adaptive control algorithm, firstly, a subdivision control table of the sine regular change of coil current of a stepper motor is designed according to a minimum subdivision granularity demand employed by the motormeter, and the subdivision control to a bottom stepper motor is realized by adjusting the index step pitch of the control table; for the scheduling control of the pointer, scheduling periods are divided in a variable-length time slot mode so as to carry out control of different time on the pointer; and the rotation mode of the pointer within a single scheduling period is designed into four stage, i.e., acceleration starting, constant velocity operation, deceleration stop and inertia termination. By designing the rotation angel speed control, the pointer position updating, the coil current adjusting step pitch, the operation scheduling period time length, the starting acceleration, the stop deceleration and the inertia termination, the stable start and stop of each pointer of the motormeter are realized, the rapid response to rapidly changed information and the smooth reflection of the slowly changed information are realized, and the pointer can be started rapidly and stopped stably and has no vibration during low velocity operation.

Description

technical field [0001] The invention belongs to the technical field of automobile electronics, and more specifically relates to a stepping motor type automobile meter pointer self-adaptive control algorithm. Background technique [0002] The instrument panel of modern automobiles generally uses a stepper motor to drive the pointer to indicate the speed, vehicle speed, water temperature and oil quantity information. The stepper motor controls the rotation of the pointer in a pulse manner. The number of pulses is proportional to the rotation angle of the pointer. The speed is directly proportional, which overcomes the shortcomings of traditional mechanical pointers such as inability to accurately measure the rotation angle of the pointer, low life, and inconvenient maintenance. However, due to the limitation of the minimum step angle of the stepper motor, and there is no position feedback, it is easy to have a series of problems such as jitter, overshoot, out of step, and inac...

AI Technical Summary

Problems solved by technology

[0002] The instrument panel of modern automobiles generally uses a stepper motor to drive the pointer to indicate the speed, vehicle speed, water temperature and oil quantity information. The stepper motor controls the rotation of the pointer in a pulse manner. The number of pulses is proportional to the rotation angle of the pointer. The speed is proportional, which overcomes the shortcomings of traditional mechanical pointers, such as the inability to accurately measure the rotation angle of the pointer, low life, and inconvenient maintenance.

However, due to the limitation of the minimum step angle of the stepper motor, and there is no position feedback, it is easy to cause a series of problems such as jitter, overshoot, out of step, and inaccurate information indication.

Images