not move easily even at high temperatures, insulation breakdown generated by the movement of the alkali metal component in the grain boundary phase does not occur easily. Therefore, withstand voltage characteristics at high temperatures of the insulator in the spark plug of this invention become high...
<div p-id="p-0001">A spark plug having an insulator formed of an alumina-based sintered material which contains an Si component and a rare earth element component that satisfy the following conditions
Kind Code: A1 Abstract: An ignition system including: a first control unit configured to generate a high voltage that is to be supplied to a spark plug at a secondary winding of an ignition coil by applying and then cutting off a primary current to a primary winding of the ignition coil;...
Such plasma jet ignition plug ignites an air-fuel mixture as follows. First, voltage is applied across a gap formed between the center electrode and the ground electrode, thereby generating spark discharge across the gap and thus causing dielectric breakdown in the gap. In this condition, electric...
applied to a spark plug having an insulator made therefrom in a high temperature environment (e.g., about 700°C), the low-melting-point glass phase is softened, or the electric field is exclusively applied to the residual pores, possibly causing breakdown (penetration of spark) of the ...