A filtering method and device

Abstract

The invention discloses a filtering method and apparatus. The filtering method and apparatus is applied to a main controller. The filtering method includes the steps: determining whether a timing unit which is running in parallel with the main controller starts timing; if so, determining whether the timing unit which is running in parallel with the main controller ends timing; and if so, filtering a square wave signal. For the filtering method and apparatus, the main controller executing the main program and the timing unit realizing timing are operated in parallel, that is, the timing process of the timing unit does not occupies the execution time of the main program. Therefore, the filtering method and apparatus can solve the problem that as the timing process occupies the execution time of the main program, the square wave signal cannot be filtered effectively.

Description

technical field [0001] The invention relates to the field of computer technology, in particular to a filtering method and device. Background technique [0002] In order to improve comfort, most passenger cars on the market widely use DC motors to realize electric control of closed parts of the car, such as sunroofs, doors and windows, etc. In order to realize the anti-pinch function of the DC motor, it is necessary to obtain the position information of the closing part of the car during the closing process of the closing part of the car. The so-called anti-pinch function means that during the closing process of the closing parts of the car, if an object or human body is obstructed within the specified range, the DC motor must be able to detect the obstruction and run in reverse. [0003] At present, the position information of the closed parts of the car is obtained by collecting the ripple current on the power bus of the DC motor. Specifically, the ripple current is high-...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned technical problems, the embodiment of the present invention provides a filtering method and device to solve the problem of low efficiency of square wave signal delay filtering due to the interrupt program of accumulated timing occupying the execution time of the main program. The technical solution is as follows :

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