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Glow plug is a simple method to improve cold start for diesel engines, especially for cold weather and conditions. In cold or iced weather conditions, diesel engines cannot reach the ignition temperature just compressing the air. Thus, heated air must be added to combustion chamber before the compressing via external device such as glow plug. Glow plug helps engine regulate the first starting and leads to obtain low emission during the cold starting or up to warm up the engine due to its controllability. Although glow plug installing is easy way to improve heat air obtaining, glow plugs have some limitations. Major problem, generated heat inside the glow plug starts from inside to outside. Thus, it takes time to obtain heated air. During the extremely cold weather conditions, one cycle not enough for heating. So, temperature of air is another major factor reducing the glow plug affect. On the contrary, induction heating is fast and efficient method and could be acceptable new generation method compared the resistive heating. Induction heating is based on hysteresis losses at high frequency switching. Induction heating has strong affect on iron based materials which has large hysteresis are. Our method is based on induction heating using 368 kHz switching frequency to improve heating capability. In addition to resistive heating, induction heating increases the heat volume. Moreover, induction heating effects the cover of the glow plug, thus improve method has no destructive affect on the core of glow plug because the surface heating.

A Novel Glow Plug Design to Improve Heating Capability via Induction Heating