4WD Climatic Emissions Chassis Dynamometers

Millbrook's 4WD climatic emissions chassis dynamometers operate at temperatures between −20°C and +50°C.

They are used to measure vehicle emissions (air quality), CO2, fuel consumption, electric consumption and range and climatic performance of passenger cars and light commercial vehicles under repeatable conditions.

Real world drive cycles can be performed and logged and then replicated on the dynamometers.


  • Large test cell: L13m × W6.5m × H3.5m
  • A high performance 4WD chassis dyno for emissions testing
  • Ambient temperature range of -20 to +50ºC
  • Compliant with current and known future European Federal and Japanese light duty emissions regulations including the WLTP
  • Separate exhaust extract system for when not wanting to use the emissions system
  • Suitable for gasoline, diesel, LPG, CNG, hybrid, electric and hydrogen vehicles
  • Connected to 12 vehicle soak bays
Millbrook 4WD Chassis Dyno | Emissions Testing | Electric Driving Range | Real Driving Emissions | PEMS

Dynamometer Specifications

  • 4 wheel drive centre mounted motor
  • Roller diameter: 1.22m (48”)
  • Wheelbase range: 1.8m to 4.6m
  • Inertia range: 454kg (800kg in 4WD) – 5448kg over WLTC
  • Max operating speed: 250 km/h
  • Max axle load 4500kg
  • Continuous power: 220kw per axle 2WD, 330kW 4WD (total)
  • Overload power (10s): 432kW per axle 2WD, 648kW 4WD (total)
  • Continuous tractive effort: 7333N per axle 2WD, 11000N 4WD (total)
  • Overload tractive effort (10s): 14666N per axle 2WD, 21600N 4WD (total)
  • Dynamic gradient simulation for 3,500 kg inertia, at least 20%
  • Simple vertical post restraint system has no vertical or lateral load on vehicle. Flexible approach to allow variety of vehicles to be tested

Emissions Equipment

  • AVL PUMA with IGEM operating system
  • 4 phase multi-phase CVS sample system up to 30m3 flow
  • Bag bench: THC, Methane, CO, NOx, NO, NO2, N2O, CO2
  • Tailpipe and engine emissions bench (1Hz): THC, Methane, CO, NOx, NO, NO2, N2O, O2, CO2
  • EGR on engine bench
  • SESAM FTIR (5Hz) – NO, NO2, N2O, NH3, CO2, CO, CH4, alcohols, carbonyls
  • Dilute CVS CO2
  • Particulate mass applicable for Euro 4 (phases and backups) and Euro 6 single filter across all phases
  • Dilute Particle number counter
  • State of charge measurement and correction for 12v and HV traction electrical systems
  • Heated and insulated CVS tunnel for Federal tests

Speed Tracking Fan

  • Speed tracking fan frontal area of 0.5m2
     up to 140km/h and 0.3m2 at 200km/h
  • Adjustable up and down to match vehicle height
  • Frontal vanes to be able to be angled
  • Fan able to be placed in set speed modes
  • Fan calibration meets regulatory requirements as a minimum

Environmental Performance

  • Temperature range: -20°C to +50°C
  • Climatic control to +/-1.5°C over test cycles measured at air onto vehicle
  • Heat absorption: 250kW @ 20°C, 150kW @ -7°C, 50kW @ -20°C
  • Temperature set-point rate of change minimum criteria: 30°C/hour if temperature >0°C, 20°C/hour if -20°C< temperature < 0°C, 1 hour from -10°C to +20°C
  • Vehicle soak temperature range: +10°C to +30°C


Contact Millbrook to find out more about its two 4WD Climatic Emissions Chassis Dynamometers and other vehicle emissions test and vehicle range test services.

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