4WD Climatic Emissions Chassis Dynamometer at Millbrook for Emissions Testing and Electric Vehicle Range Testing

4WD Climatic Emissions Chassis Dynamometer

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

It is used to measure:

  • Vehicle emissions (air quality)
  • CO2
  • Fuel consumption
  • Electric Consumption and Range
  • Performance
  • 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 dynamometer.


  • 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 restraint system has no vertical or lateral load on vehicle. Flexible approach to allow wide 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

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