Vehicle ECU Update Sequencing for Stable Rollback Control

The patent segments the update process into distinct phases: application software updates are executed first for all relevant ECUs, then basic software updates are executed afterward. This segmentation prevents mixing of different software versions during simultaneous updates, maintaining system reliability while still allowing parallel update execution within each phase.

The patent performs preliminary actions by first updating application software before updating basic software. This preliminary sequencing ensures that when basic software is updated, the application software layer is already at its target version, preventing version mismatch conflicts and enabling more reliable simultaneous basic software updates across multiple ECUs.

The patent divides the rollback process into segmented steps corresponding to the update phases. Rollback is first attempted for application software updates, and only if those succeed does the system proceed to basic software updates. This segmented approach simplifies rollback management compared to handling all updates simultaneously, as each phase can be independently rolled back without affecting the other phase's state.

The patent implements preliminary rollback preparation by establishing the update sequence before execution. The system prepares rollback mechanisms for application software first, then for basic software. This preliminary structuring of rollback procedures reduces operational complexity during actual update failures, as the rollback path is pre-determined and follows the same phased approach as the update process.