Overview
ISO 19585:2019 - "Heavy commercial vehicles and buses - Vehicle dynamics simulation and validation - Steady-state circular driving behavior" defines a repeatable method to compare vehicle dynamics simulation results with measured test data from physical steady‑state circular driving tests (as specified in ISO 14792). The standard is focused on validating that a vehicle model can predict steady‑state circular maneuver behavior for heavy vehicles and buses (vehicle classes M3, N2, N3, O3, O4 per ISO 3833).
Key topics and technical requirements
- Purpose: Provide a discriminatory, repeatable process to overlay simulation outputs with physical test curves and evaluate deviations against tolerance boundaries for model validation.
- Applicability: Heavy commercial vehicles, commercial vehicle combinations, buses and articulated buses (trucks/trailers > 3.5 t; buses > 5 t).
- Test types: Uses the steady‑state circular driving procedures from ISO 14792. Typical test methods include:
- Constant radius with slowly increasing velocity
- Constant speed with slowly increasing steering wheel angle
- Essential variables to record and simulate:
- Longitudinal velocity (vx)
- Steering‑wheel angle (δH)
- Lateral acceleration (ay)
- Roll angle of the first vehicle unit (φ)
- Recommended additional variables: steering torque, yaw rate, sideslip, cabin lateral acceleration, axle accelerations, articulation angles.
- Model input requirements:
- Basic vehicle parameters (directly measurable): mass, geometry, axle/coupling positions - model input deviations are recommended to be minimized (e.g., axle/coupling position deviation example: ±0.02 m).
- Estimated parameters (may require fitting): centre of gravity height, tyre lateral force characteristics, mass moments of inertia, suspension kinematics and compliance, steering system behavior.
- Additional model elements: powertrain, chassis stiffness, cabin suspension, active braking and stability systems, and driver control representation.
- Validation procedure: define reference curves and tolerance boundaries from tests, overlay simulation results, compute gradient/boundary points, and repeat validation when vehicle configuration or key basic parameters change.
Practical applications and users
- Vehicle OEMs validating multibody or full‑vehicle simulation models for handling and stability
- Tier‑1 suppliers of suspension, steering, tyre and control systems
- Test houses and proving grounds performing model‑to‑vehicle correlation
- Researchers and regulatory bodies assessing simulation credibility for heavy vehicle dynamics
Related standards
- ISO 14792 - Steady‑state circular tests (test method referenced)
- ISO 3833 - Vehicle types, terms and definitions
- ISO 8855 - Vehicle dynamics vocabulary
- ISO 15037‑2 - General conditions for heavy vehicle tests
- ISO 19364 - Passenger cars - steady‑state circular validation (analogous guidance)
Using ISO 19585:2019 improves confidence that a vehicle dynamics model reliably represents real steady‑state circular behavior for heavy vehicles, supporting simulation‑based development, safety assessment and component design.