Research Of Automatic Testing System Of Magneto Stators Based On Virtual Instrument

Magneto is a small alternator, the magnetic field of which is generated by the permanentmagnet. It is the ignition power supply in gasoline engine ignition system and widely used inthe small gasoline engine, motorcycle, garden machinery and other fields. Its performancedirectly determines the performance of the ignition engine spark plug and has an importantinfluence on fuel efficiency and vehicle performance. In order to meet the testingrequirements of magnetic motors of capacitor rechargeable ignition (CDI) and improve theaccuracy, efficiency and automation level, an automatic testing system based on virtualinstrument was investigated.The data acquisition and processing was done in a high speed, and the mechanical andelectric action can be controlled in overall with the card PCI-1714UL and industrial I/O cardPCI-1761, which makes the testing system with a high level of automation and flexibility.With the industrial control computer as the hardware platform, the modular design wasadopted in this system. The communication in each functional module is through the queuemessage and the multithreading control was developed, so the problems of high-speedacquisition and processing of transient signal and anti-interference were solved. The HMI wasdesigned with operation of manual and automatic modes, which makes the voltage waveformand testing parameters can be observed in a real-time.A new test method was used in this system. There is no need a simulation of magnetoignition to collect the ignition time. The voltage signal acquisition, filtering, time-frequencyand peak processing were implemented to measure the peak voltage and ignition advanceangle in synchronous. The magneto ignition energy was tested with sync integral operation fordischarge voltage and current which were obtained through the high-speed synchronous dataacquisition, capture and filtering. So the defects of traditional test methods were made up inthis system.This testing system had been verified with the designed testing benches and it canachieve various performances of two magneto stators in once with the efficiency improved by80%. The results indicate that this system has high reliability, flexibility and measuringprecision and reduces costs and labor intensity dramatically. So there is not only a greatmarket value in the field of magneto stators testing, but also an important reference value ofthe development of other automatic measurement system.