HIL Testing

Hardware-in-the-Loop validation

Validate HMI behavior on real ECUs and hardware test rigs. AskUI AI agents interact with physical displays the way an operator does, no hardcoded coordinates, no brittle template matching.

ECU rigs · CAN/LIN bus · Camera capture · Real displays · dSPACE · Vector · NI

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Test topology · HIL TestingLive

ECU Rig

Real hardware

HMI Display

Camera capture

CAN/LIN

Signal injection

Diagnostics

UDS/OBD

AskUIValidating

Real HW

Validated

100%

Automated

Audit

Evidence

Case study →

Electronics test bench with oscilloscope, multimeter and PCB

Realhardware

Validate on actual ECUs, not simulated environments. Catch what SIL misses.

0pixel templates

Vision-based agents, no brittle screenshot matching or hardcoded coordinates

Overnightregression

Run full HIL regression suites unattended. Results ready by morning.

Autoevidence

Screenshots, video recordings, and signal traces captured for every test step

HIL test rigs validate that embedded software behaves correctly on real hardware, but validating the HMI layer on those rigs is still manual. Camera-based capture shows what the display renders, but existing tools require pixel-perfect template matching that breaks on every theme change, localization variant, or resolution update. AskUI replaces brittle image matching with AI agents that understand UI elements semantically. Inject CAN/LIN signals, simulate sensor inputs, and validate that the HMI responds correctly across ECU variants, display resolutions, and software versions.

The challenge

Why existing tools fall short

Manual HMI validation on rigs

HIL rigs validate ECU logic and signal behavior. But validating what the driver actually sees on the display (warning icons, gauge responses, screen transitions) is still done by a human operator watching the screen.

Brittle image matching

Camera-based tools use pixel-perfect template matching. A theme update, a localization change, or a different display resolution breaks every template. Teams rebuild image libraries for every variant.

Variant explosion

Each vehicle variant has different ECU configurations, display sizes, and software versions. The number of HMI states to validate multiplies across variants. Manual coverage is impossible.

Evidence gaps

Auditors need evidence that the HMI was validated on real hardware, not just simulation. Manual testing produces inconsistent documentation. Screenshot folders are unstructured and incomplete.

What AskUI delivers

One suite. Full coverage.

Vision-based HMI validation

Validate display output on real hardware without brittle image templates.

—Camera capture of physical displays: cluster, IVI, HUD
—Semantic UI understanding, not pixel matching
—Works across resolutions, themes, and localizations
—No template library maintenance

Signal-triggered test flows

Inject CAN/LIN signals and validate the HMI response in a single automated flow.

—CAN/LIN signal injection via dSPACE, Vector, NI integration
—Validate HMI response to sensor events and fault conditions
—End-to-end: signal in → display response → pass/fail
—UDS/OBD diagnostic readout validation

Unattended overnight regression

Run full HIL regression suites overnight with structured evidence for every run.

—Scheduled execution on rig infrastructure
—Video recording + screenshot evidence per test step
—Signal trace correlation with display state
—Variant-by-variant pass/fail matrix

Compliance & evidence

Evidence generated automatically

ISO 26262 evidence

Structured test evidence on real hardware for functional safety validation.

ASPICE-ready reporting

Automated test reports aligned with ASPICE process assessment requirements.

Variant coverage matrix

Evidence of HMI validation across all ECU/display/software variant combinations.

Signal trace audit trail

Correlated CAN/LIN signal traces with HMI state for every test execution.

How it works

From intent to traceable results

Describe intent

Natural language or CSV. Describe what to do, not where to click.

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Run adaptively

Real-time screen interpretation. Adapts to changes without re-programming.

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Validate, report & document

Full traceability: pass/fail, screenshots, timestamps. Audit-ready reports and user manuals generated from every run.

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Integrate anywhere

APIs for capture & simulation. Self-hosted or edge-deployed.

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Works on any HMI · Desktop · Mobile · Embedded