Electronic control device with non-volatile memory
AssigneeHitachi Automotive Systems, Ltd.
InventorKenji Masuda
Life of this patent
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Abstract
The present invention detects a battery abnormality during a driving cycle or self-shutdown even when a battery voltage sensor is not mounted. In the present invention, a first storage region is provided with a failure information storage region and a second storage region management information storage region, a second storage region is provided with a failure information storage region and a first storage region management information storage region, and a management information access flag storage region for storing access information indicating a presence or absence of an access to management information of the first storage region and management information of the second storage region is provided separately from the first storage region and the second storage region.
Claims9
An electronic control device, comprising a nonvolatile memory including a plurality of storage regions,
- wherein the storage regions include
- an information storage region for storing information, and
- a management information storage region for storing management information indicating a write state of information to the storage regions, and
- the nonvolatile memory includes, separately from the storage regions, a management information access flag storage region for storing access information indicating a presence or absence of an access to the management information,
- and further comprising a processor accessible to the nonvolatile memory,
- wherein the processor diagnoses a battery disconnection or a battery voltage drop abnormality in a last driving cycle or self-shutdown based on the management information and the access information at a time of start of a current driving cycle.
An electronic control device comprising a nonvolatile memory including a plurality of storage regions,
- wherein the storage regions include
- an information storage region for storing information, and
- a management information storage region for storing management information indicating a write state of information to the storage regions, and
- the nonvolatile memory includes, separately from the storage regions, a management information access flag storage region for storing access information indicating a presence or absence of an access to the management information, and wherein
- during a driving cycle,
- the management information storage region holds a start mark indicating a write start of the information, and
- the management information access flag storage region holds a start mark access flag indicating a presence or absence of an access to a registration address of the start mark, and
- during self-shutdown,
- the management information storage region holds a completion mark indicating a write completion of the information, and
- the management information access flag storage region holds a completion mark access flag indicating a presence or absence of an access to a registration address of the completion mark.
Dependencies are inferred from the claim text.