Climatic / Environmental Testing

Climatic / Environmental Testing

Today’s vehicles are expected to perform reliably and to specification in the extreme range of conditions experienced across the world, from sub-zero conditions in Antarctica to the humid heat of the tropical rain forests.

It is essential during a vehicle development programme that the vehicle is tested in facilities which can simulate every kind of driving condition.

Hofmann TeSys has a range of specialist dynamometers to provide accurate and repeatable road load simulation, speed, force, and acceleration control. Variable speed cooling fans can also be provided to reproduce the required air flow simulation.

Hofmann TeSys chassis dynamometers for climatic testing are available as standard in single roller, 4×2, 4×4, and independent configurations.

The precision manufactured rollers are available from 0.5m to 2.5m in diameter, running in rolling element bearings which may be temperature controlled according to the application. Roller assemblies can be coated to increase tyre traction.

Trunnion mounted AC motors which compensate for system losses and simulate road load forces, vehicle inertia, and gradient are mounted on the dynamometer base frame. Insulated floor plates and roller covers protect the motors from extremes of temperature.

The dynamometer base frame can be mounted on a moving carriage to provide wheelbase adjustment to accommodate different vehicles. Roller centres can be set automatically as part of the road load model information, or set to the user’s specific dimensions.

The dynamometer is provided with a real-time control processor, distributed I/O architecture and a GUI processor with a Windows 10 operating system. A powerful data logger can store system and vehicle parameters. A real-time graphics package can display this information on screen.

A central server function and host computer interface are available to enable data to be passed in either direction.


Temperature range -40°C to +60°C
Humidity range 5 to 95% RH
Altitude range -100 m to 4000 m




Speed range 250 km/h
Absorption power per axle 150 kW
(65 – 250 km/h)
Force per axle 8300 N
(0 – 65 km/h)
Inertia simulation range 700 – 5500 kg
Wheelbase adjustment 4000 mm
Roller diameter 1600 mm
Width 1000 mm
Spacing 750 mm

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