Emission Testing

This solution is designed to verify a wide range of vehicles on their compliance with both current and future worldwide exhaust emission standards.

AVL Approach

AVL ROADSIM combined with a human driver drives the test vehicle. A driver's aid system supports the driver in performing different standardized driving cycles. For repeatable conditions a vehicle cooling fan with laminar airflow is used.

Benefits at a Glance

  • Proven record of numerous installations worldwide
  • Local service capability with short response time
  • Driven bearings for highly repeatable parasitic losses
  • Highly accurate tractive force and speed measurement for emission testing
  • Dead weight calibration through zero without demounting of calibration device and zero-point shifting

Technical Data

Vehicle types supported

Range from all-terrain over light-duty and medium-duty up to commercial vehicles with front wheel and/or rear wheel driven axle:

The following specification shows the typical values of the product AVL ROADSIM 48" MIM CAR and is subject to change. For more detailed information concerning this product or other products of our emission testing product range please click here. Alternative technical configurations are available upon request.


Nominal power in motor mode (per axle)

150kW @ v≥92km/h


Nominal tractive force in motoring mode (per axle)

5,870N @ v<92km/h


Max. speed



Max. axle load


Test conditions

Environmental conditions:
Temperature: +5°C … +40°C
Rel. humidity, not condensed: max. 95%


Transient development tasks

  • Hardware verification
  • Verification of control unit calibration
  • Exhaust emission certification

System Scope

Chassis Dynamometer
The chassis dynamometer is designed for transient testing requirements. It includes an AC dynamometer specifically designed for vehicle testing. An encoder mounted on the dynamometer shaft provides highly accurate speed measurement. Tractive force is measured using a load cell. It can be upgraded by a second axle for all wheel-driven vehicles.

The AVL ROADSIM chassis dynamometer includes a calibration device for the accurate tractive force measurement system, a fan for the AC-drive and a special metal roller surface for simulating realistic road load conditions. The chassis dynamometer controller VECON provides the fundamental control function for transient testing modes and monitors the vehicle.

Optional Exhaust Emission Measurement
This includes measurement for fuel economy and exhaust gases. For both diluted and undiluted exhaust gas sampling and analysis, AVL exhaust gas emission benches, particulate sampling systems, soot and opacity smoke measuring devices are considered.

Vehicle Cooling
For repeatable testing conditions, a vehicle cooling fan is used. The rotational speed of the fan is controlled. It is mounted on a support structure with four moveable rollers. This allows the fan to be aligned with the front of the vehicle e.g. to cool the engine radiator. The fan control cabinet sets the speed dependent flow rate via a frequency converter.

Test System Mechanics
The test system mechanics include a suitably sized and robustly designed vehicle restraint system and an optional vehicle monitoring system. The vehicle position monitoring system alerts the user of any movement of the test vehicle's position. The restraint system on the front and rear of the vehicle allows for highly dynamic acceleration and deceleration during test runs. On a 2WD layout the wheels of the non-driven axle are firmly fixed on the floor using the wheel holding devices. The driven vehicle axle is fixed with belts as standard. Alternatively, a bar system is available.

System Integration and Start-Up Service
The system integration service contains all services for an efficient project execution from project kick-off until final acceptance. In addition, a pre-acceptance on AVL site and FOB packing and transport can be chosen. With the 'extended start up services' extension, the user is supporting in reaching his or her initial knowledge for optimal system operation.