A production method of a vinyl resin, which comprises subjecting a vinyl compound to suspension polymerization in a polymerization tank equipped with a reflux condenser in the presence of a dispersion stabilizer, wherein a polyvinyl alcohol resin having a degree of hydrolysis of not less than 65 mol %, a polymerization degree of not less than 700 and satisfying the following formula . In the first pass, a snapshot of all configuration values of selected peripheral devices is taken. The ratio of coated and uncoated gas generant bodies within an airbag inflator may be tailored to provide S-curve inflation performance. The comparing circuit is electrically connected to the phase-shifting circuit and receives the phase-shifting signal to generate a comparing signal.