On-vehicle control apparatus

Details On-vehicle control apparatus On-vehicle control apparatus

2006-08-21

2011-10-11

Tran, Khoi (Department: 3664)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Vehicle diagnosis or maintenance indication

C701S114000, C701S001000, C701S031000, C701S035000, C701S115000

Reexamination Certificate

active

08036786

ABSTRACT:
Provided is an on-vehicle control apparatus capable of automatically initializing control variables in a backup RAM only in rewriting a control program in the market. The on-vehicle control apparatus includes a CPU for controlling an on-vehicle device according to a control program, a non-volatile ROM for storing the control program therein, a backup RAM for storing control variables therein, a backup power supply circuit for supplying power to the backup RAM, a boot program for rewriting the control program, an address changeover circuit for making a changeover in execution address, and a memory rewrite unit. The memory rewrite unit outputs a rewrite signal, a command signal group including a command for activating the boot program, and an erasure command signal for erasing a diagnostic code. The control program initializes the control variables in the backup RAM in response to the erasure command signal when being activated after having been rewritten.

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patent: 6243627 (2001-06-01), Ozeki
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patent: 7890227 (2011-02-01), Sayama et al.
patent: 9-288573 (1997-11-01), None

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