The control method of anti-blocking and anti-lost steps of stepping motor

Abstract

The invention relates to a control method for preventing rotation clogging and step loss of a stepping motor, and relates to the technical field of heating ventilation and air conditioning. The control method comprises the following control steps: (1) controlling an air door motor during electrification for the first time; (2) controlling a reset process control; (3) controlling an actual motion angle. In implementation, the following control steps can be continuously added according to requirements: (4) controlling automatic detection rotation clogging in the intermediate operating process; (5) repairing for the first time; (6) repairing for the second time; (7) carrying out repair treatment. The control method has the beneficial effects that control is carried out through a special circuit control module and single-chip microcomputer programming, a driving module of the stepping motor can detect rotation clogging signals in the motor operating process and the problem of generating rotation clogging or step loss is solved in the operating process. In the verification process, air doors are controlled to reach an expected target under various failure modes, and the step loss of the stepping motor in the using process cannot be caused by control problem.

Description

technical field [0001] The invention relates to the technical field of heating ventilation and air conditioning (HVAC), in particular to a control method for preventing blocking and losing steps of a stepping motor. Background technique [0002] The damper of the current HVAC is mainly controlled by a carbon film servo motor, and there is no problem of damper blocking or lost steps during its use. Because the stepping motor can meet the requirements of light weight of the whole vehicle, HVAC design can be modularized and platformized, and the damper control line has high control accuracy, HVAC is more and more applied to the control field of automobile air-conditioning damper. There are many, and the price is getting cheaper and cheaper, forming a good environment for use. It is expected that in the HVAC assembly of automotive air conditioners in the future, the motors that control the movement of the damper will increasingly adopt the control mode of stepping motors. [0...

AI Technical Summary

Problems solved by technology

Its disadvantages are: because it is impossible to judge the position of the damper, there may be excessive stalled operation during the self-learning process. In addition, the release of the damper interference is not designed in the later stage, and long-term use will cause the damper to be permanently damaged. out of shape

Its shortcoming is that the control deviation caused by lost steps cannot be corrected in time (with this self-study, there will be no third step, usually one of the two)

Its shortcoming is that it will conduct a self-study every time it is turned on, and it needs to be delayed for a period of time before turning on the air conditioner, which may cause complaints from some impatient customers

The disadvantage is: if the customer does not set the limit position, the step loss caused by the damper operation cannot be repaired in time

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