Heavy-Duty Emissions Certification and Audit
Heavy-duty vehicle chassis evaluations are performed using a 48-inch twin-roll chassis dynamometer. The dynamometer can simulate vehicle weights up to 120,000 pounds for tandem axle vehicles and 60,000 pounds for single-axle vehicles at a maximum of 600 horsepower. It is equipped with an electric motor drive for each roll that may operate to test single-axle, tandem-axle or four-wheel drive vehicles. In addition to steady-state testing, transient tests can be performed that simulate road load, vehicle inertia and road grade. This allows simulation of in-service vehicle operation.