Overview
ISO 2534:2020 - "Road vehicles - Engine test code - Gross power" defines a standardized method for testing internal combustion engines used to propel road vehicles to determine gross power and related performance data. The standard covers both reciprocating (spark-ignition and compression-ignition) and rotary piston engines (excluding free-piston types). It is intended primarily for technical communication between engine manufacturers and vehicle manufacturers and requires that any advertised ratings clearly state they are gross power in accordance with clause 9.2.
Key topics and requirements
- Scope and applicability: Applies to engines for passenger cars, trucks and other road vehicles (excluding motorcycles, mopeds and agricultural tractors normally travelling on roads).
- Measurement accuracy: Defines required precision for measuring torque, engine speed, fuel flow, temperatures, barometric pressure, inlet and exhaust pressures, and other instrumentation.
- Test setup and auxiliaries: Specifies which engine-driven auxiliaries must be fitted or removed and how to set test conditions and cooling/thermal-management systems.
- Test procedure and data recording: Describes full-load testing to produce power curves and specific fuel consumption (SFC) as functions of engine speed, and lists required recorded data.
- Power correction factors: Provides methods to correct measured power to reference atmospheric conditions, including special provisions for naturally aspirated, pressure‑charged, and turbocharged engines (including a factor for turbochargers with ambient-compensation systems).
- Smoke measurement: Includes measurement and correction procedures for smoke (compression‑ignition engines).
- Reporting and verification: Defines the required test report content, designation and notation for declared gross power, torque and SFC, and tolerances for declared values.
- Recent updates: Third edition adds requirements for exhaust particulate filter restriction, engine cooling active thermal management settings, and a correction factor for certain turbocharged systems.
Applications
- Generate certified gross power curves and specific fuel consumption maps for engine development and validation.
- Provide a common test basis for engine-to-vehicle integration, procurement, and contractual performance specifications.
- Support engine manufacturers in producing comparable, traceable performance data for design reviews, calibration, and quality control.
- Aid regulatory labs, test facilities and OEM test benches in producing standardized test reports used in technical documentation and product communication.
Who uses this standard
- Engine manufacturers and test laboratories
- Vehicle manufacturers (powertrain integration teams)
- OEM quality and validation engineers
- Technical consultants and certification bodies conducting engine performance verification
Related standards
Keywords: ISO 2534:2020, engine test code, gross power, engine testing, power curves, specific fuel consumption, turbocharged engines, compression-ignition, spark-ignition.
