ceengland7(at)gmail.com
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 Posted: Sun Dec 22, 2019 1:58 pm Post subject: One battery/two alternators *E-fuel injection engine* z-diag |
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Hi Bob,
When you're done with revising Z-12, how about taking a swing at a new diagram specifically for engines using automotive style fuel injection controllers? Current demand for just the engine in these systems run in the 12-15A range, due to extra power needed to run the high pressure fuel pump and the injectors, in addition to the ignition.
Largely because of the above, two alts with their unlimited endurance (and lighter weight) seem to make more sense than multiple batteries. With many alternative engines, we also have the option of installing two identical alts, eliminating the need for an endurance buss.
Given the above, and with the (somewhat aspirational) goal of having 'switchology' come as close as possible to traditional a/c (for muscle memory safety in stressful situations), I visualize a separate engine buss with everything except the starter controlled by a high current switch, and a dedicated alternator feeding the buss. Once 'alive', it should operate much like a P-mag equipped Lyc, continuing to make its own electrical power regardless of airframe status. A buss tie switch would allow powering the engine buss from the a/c buss if there's an alternator failure, and allow powering the a/c buss from the engine's alternator if the a/c alternator fails.
The basic architecture should allow the same emergency switching as conventional a/c: the entire a/c could be powered down without affecting the engine's operation.
With more and more E-dependent engines flying now, I hope this architecture idea will get some attention.
Charlie
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