Method for retaining the correction value of a control variable in an engine control device
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United States of America Patent
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Mar 5, 1996
Issued Date -
N/A
app pub date -
Jun 7, 1994
filing date -
Feb 26, 1991
priority date (Note) -
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Abstract
A method of storing a correction value of a control variable in an engine control device includes the steps of transferring a correction value stored in a RAM to an E.sup.2 PROM by serial communication immediately after a power supply switch is turned off. The correction value stored in the E.sup.2 PROM is then transferred back to the RAM immediately after the power supply circuit is turned on. In this way, when the engine control device is not in operation, the correction value is retained in the E.sup.2 PROM.
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