The Development And Application Of Critical Technology In The Testing And Controlling For Automobile And Machine

The noise and vibration of automobile are the major factor that influences the comfort of automobile. Reducing noise and vibration is one of the important subjects in design and manufacture. The method that measuring systems aided by computer is used to check out the signals of noise and vibration is one of major methods to locate the source of noise and vibration. Windows operating system have gotten the extensive use because of his close friendly interface and use. The old measuring system aided by computers can't be applied to the Windows operation system. There are many difficulties in new environment to be solved.Firstly, Reason and mechanism of losing data in sampling under Windows98 operating system was inquired as well as hardware can not be visited under Windows2000 in the ordinary application. The study of compiling the Windows's WDM drive through DDK has been gone deep into. Query sampling and interrupt sampling have been realized by way of the drive procedure. And the two kinds of sampling methods are expounded detailed.The measurement torsion and rotating speed can adopt time reckoning and the numeral count law. The counter 8254 of the system and the outside clock are used directly in the time reckoning method to reckon the time of square wave given rise by the torque sensor. The torsion and the rotating speed value can be gotten. The numeral count law get the value of torsion through numeric pulses according to the principle that the torsion value obtained does not need concrete tune span but the ratio of two time spans. Then the merit and shortcoming of two kinds of methods have been compared, and the precision and error of the numeral count law have been analyzed.It is fairly common in the open-loop control system that PC is used to control stepping motor. The research for controlling stepping motor under Windows has been done. The software for controlling stepping motor has been compiled in the chip 8255 on AD board after analyzing the relationship of stepping motor between torsion and frequency. The software figure out the frequency in the processes of acceleration, deceleration and at the highest speed according the property of stepping motor and the concrete load, then the pulse signals are sent to control the stepping motor and complete the open loop control.