Engine control system including non-volatile memory and correction data transfer method
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United States of America Patent
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-
Sep 7, 1982
Grant Date -
N/A
app pub date -
Apr 11, 1980
filing date -
Apr 13, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and a system for engine control are disclosed. Electrical signals representing the engine operating conditions are detected, which electrical signals, together with the control data stored in a memory, are used to calculate a correction factor for correcting the control data for controlling the engine, where the correction factor is stored in a volatile memory, thus controlling the engine on the basis of the control data corrected by the correction factor. The correction factor stored in RAM is transferred to a non-volatile memory under predetermined conditions. Even if the voltage applied to RAM is reduced to a level lower than the storage ability of RAM, resulting in the loss of the stored data, the correction factor stored in EAROM is transferred back to RAM upon restoration of a normal voltage at RAM.
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