Speed dependent rolling resistance evaluation of a twin roller chassis dynamometer for heavy-duty vehicles

The current interest in quantifying real-world emissions from heavy-duty ve hicles has led to a far more extensive use of chassis dynamometers than eve r before. Depending upon the objectives of chassis dynamometer testing, a r ange of different driving schedules could be employed to operate vehicles o n the dynamometer. This paper addresses the losses associated with tyre-rol ler interaction on a chassis dynamometer. In this paper, a theoretical anal ysis has been conducted to evaluate the rolling resistance, as a function o f vehicle speed, experienced by heavy-duty vehicle tyres on a twin-roller c hassis dynamometer. This study focuses on the constant torque method to mor e accurately evaluate the parasitic losses of the dynamometer. Thus, a more accurate dynamometer control scheme could be implemented to simulate the r oad load for better assessment of a vehicle's performance and exhaust gas e missions measurements.