BS ISO 10521-1:2006

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Required overall measurement accuracy
5 Road-load measurement on road
  5.1 Requirements for road test
      5.1.1 Atmospheric conditions for road test
      5.1.2 Test road
  5.2 Preparation for road test
      5.2.1 Vehicle preparation
      5.2.2 Installation of instruments
      5.2.3 Vehicle preconditioning
  5.3 Measurement of total resistance by coastdown method
      5.3.1 Multi-segment method
      5.3.2 Average deceleration method
      5.3.3 Direct regression method
  5.4 Onboard-anemometer based coastdown method
      5.4.1 Selection of speed range for road-load curve
            determination
      5.4.2 Data collection
      5.4.3 Vehicle coastdown
      5.4.4 Determination of coefficients
      5.4.5 Determination of total resistance
  5.5 Measurement of running resistance by torquemeter
      method
      5.5.1 Installation of torquemeter
      5.5.2 Vehicle running and data sampling
      5.5.3 Calculation of mean speed and mean torque
      5.5.4 Running resistance curve determination
  5.6 Correction to standard atmospheric conditions
      5.6.1 Correction factors
      5.6.2 Road-load curve correction
6 Road-load measurement by wind tunnel/chassis dynamometer
  6.1 Aerodynamic drag measurement in wind tunnel
      6.1.1 Requirements for wind tunnel
      6.1.2 Testing procedure
      6.1.3 Test result
  6.2 Rolling resistance determination with chassis
      dynamometer
      6.2.1 Testing device
      6.2.2 Testing procedure
      6.2.3 Test results
  6.3 Total-resistance calculation
  6.4 Total-resistance curve determination
Annex A (informative) Examples of onboard-anemometer
                      calibration procedure
Annex B (informative) Examples of dynamometer-measured
                      rolling-resistance correction method

Defines methods of determining the road load of road vehicles for subsequent test purposes, for example, fuel consumption tests or exhaust emission measurements.

This part of ISO 10521 specifies methods of determining the road load of road vehicles for subsequent test purposes, for example, fuel consumption tests or exhaust emission measurements. This determines the road load of a vehicle running on a level road under reference atmospheric conditions. It is achieved by either the coastdown method, the torquemeter method or the wind-tunnel/chassis-dynamometer method.

This part of ISO 10521 is applicable to motor vehicles, as defined in ISO 3833, up to a gross vehicle mass of 3 500 kg.