TCU / approved vehicle services
Vehicle evidence
OwnsSignal source, event sequence and device health
Must not inferNo cloud or app success is inferred from local observation alone
AutoBuild your programPublic reference architecture
Connected Vehicle System
One freshness-aware vehicle truth from edge evidence to owner experience.
Separate device receipt, cloud projection, authorized command request and physical vehicle outcome while keeping identity, consent and lifecycle coherent.
Authority by layer
Know which component owns the state—and what it must never infer.
Every layer exposes an authoritative responsibility and an explicit non-authority boundary.
Device gateway
Secure ingress
OwnsDevice identity, schema, sequence, consent and durable receipt
Must not inferReceipt is not digital-twin projection or business completion
SAAS-01
Vehicle cloud
OwnsFreshness-aware twin, trips, events, policy and command lifecycle
Must not inferNever invents physical execution without adapter evidence
APP-02 / OEM channels
Owner and operations
OwnsPresentation, intent and user acknowledgement
Must not inferUI wording cannot advance vehicle state
End-to-end operating flow
State advances through evidence—not optimistic UI.
Each transition names both the action and the identity or version evidence that makes it reproducible.
- 01
Observe
Normalize an approved source event with unit, quality, source time and sequence.
device · schema · signal profile · event identity - 02
Buffer
Encrypt and prioritize during weak connectivity using bounded store-and-forward.
queue class · capacity · drop/gap record - 03
Reconcile
Deduplicate, preserve late evidence and advance only a newer qualified twin.
event time · receipt time · watermark · consent - 04
Request
Authorize a remote intent against role, vehicle state, nonce, expiry and capability.
actor · policy · idempotency · context revision - 05
Resolve
Expose requested, delivered, acknowledged, completed, rejected, expired or uncertain distinctly.
adapter receipt · terminal source · correlation
Contract families
Interfaces that a production program must own.
Telemetry ingress
Versioned signals, source clocks, sequence, quality and consent.
Digital twin
Current/historical state with source, freshness and projection revision.
Remote actions
Capability, preconditions, nonce, expiry, idempotency and terminal evidence.
Lifecycle
Provisioning, configuration, health, update, transfer and decommission.
Designed degradation
Failure states stay truthful and useful.
No network
Retain bounded priority events and declare queue pressure or loss; never backfill silently.
Duplicate or late delivery
Preserve source identity, project once and never regress the twin watermark.
Consent withdrawn
Stop new projection for the purpose and preserve only approved audit evidence.
Command acknowledgement missing
Expose uncertain/expired state; do not display vehicle completion.
Security & privacy controls
Privilege follows the narrowest useful boundary.
- ✓Unique device and service identity with tenant/program binding
- ✓Purpose, role and field policy before storage or projection
- ✓Mutually authenticated ingress and replay-resistant command envelopes
- ✓Owner transfer revokes prior rights and rebinds vehicle context
- ✓Secrets, VIN and precise location are redacted from support traces
Release evidence
A green demo is not a production acceptance case.
- 01Signal/schema compatibility and source-binding tests
- 02Network loss, duplication, gap and delayed-delivery replay
- 03Consent, ownership-transfer and retention evidence
- 04Remote-action authorization, timeout and uncertain-outcome tests
- 05Target TCU/vehicle/cloud/app correlation and rollback evidence
Independently scopeable products
Compose the system without collapsing product ownership.
Each product can be bought and operated independently while sharing identity, context and lifecycle contracts.
OEM program workshop
Turn the Connected Vehicle System reference into your program architecture.
Confirm target products, vehicle and cloud boundaries, source systems, contract versions, deployment, validation and lifecycle ownership.