ISO 19585:2019

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.