24 May '15, 3pm

Inductively sense aircraft engine valve position

All the available designs I have found for aircraft ignition systems use a single coil for two spark plugs, including a system I designed more than 10 years ago. This design only requires crankshaft position, as it fires one cylinder on compression at the same time as the other cylinder is on the exhaust stroke. There are a couple disadvantages to the coil for two plugs. The waste spark on the exhaust cylinder requires extra voltage. The polarity of the two spark plugs is opposite by design. A spark plug should have a negative polarity applied to the center electrode which runs hot due to the thermal isolation of the insulator and the plug design. The hot center electrode prefers to emit electrons. The plug will spark at a lower voltage with a negative polarity on the center electrode. The last disadvantage of the dual plug coil is that a single coil failure affects two cy...

Full article: http://www.edn.com/design/sensors/4430035/Inductively-sen...

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