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Date: Fri, 21 Jan 2005 11:39:03 PST
From: mojavegnospamveg.iwvisp.com (Everett M. Greene)
Subject: Re: Opened DI Casette - For those interested


(Goran Larsson) writes: > Everett M. Greene <mojavegnospamveg.iwvisp.com> wrote: > > > Nobody has identified any "electronics" > > in the units and even if there is, that might not be the > > cause of the failures. > > What makes you believe that there is no electronics inside a DI > cassette? I didn't say there was none. I said nobody had identified any. You now have. > AFAIK the DI cassette contains two major functions, a capacitive > discharge ignition system and an ion sensing circuit. > > Capacitive discharge ignition system > > One 12V to 400V voltage converter. > One large capacitor charged to 400V. > Four (one for each spark plug) capacitive discharge spark > generators with > - A thyristor (red DI) or a triac (black DI) > - drive electronic for thyristor/triac for each spark plug > - HT coil for each spark plug > The DI connector has one pin for each spark generator. The > ignition timing is done by the Trionic ECU. > > Ion sensing circuit > > One 12V to 80V voltage converter. > Four (one for each spark plug) ion sensing circuits using the > 80V to ionize the gasses in the spark plug gap. > The DI connector has two pins for the ion signal, one for > cylinder 1 and 4, one for cylinder 2 and 3. The Trionic ECU > knows which cylinder is in the combustion phase. > > The circuit board containing the electronics is the same size as > the expoxy filled area, i.e. the whole length of the cassette.

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