Generator Regulation for Increased Ni-Cd Battery and Generator Life 700212

Under severe service, Ni-Cd battery life is shortened considerably as a result of being recharged at a high rate while at elevated temperature. In addition, generator life is shortened by the practice of “cross-firing”-using the generator of the first engine started to help the battery start the second engine. Experimental results illustrating these operational problems, and their magnitude, are shown for two modern typical aircraft.
These problems are alleviated through use of a new type regulator which senses battery temperature and reduces charge rate as temperature increases, and limits the maximum generator output. This device is described and service test results are discussed.


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