Memory device for automobile engine control microcomputer - has back=up voltage supply for maintaining memory contents upon battery disconnection

摘要

The memory device (12) is coupled to a back-up voltage supply (16) providing the voltage for retaining the memory contents when the memory device (12) is disconnected from the vehicle battery (22). The back up voltage supply (16) is used for memory devices for an engine microcomputer and as automatic transmission microcomputer. It may use a solar cell coupled to a charge storage capacitor. ADVANTAGE - Prevents loss of control parameter data.