Investigation on Emergency Brake Property of a Heavy-Duty VehicleBased on Functional Virtual Prototyping Model

摘要

A Functional Virtual Prototyping full vehicle model for a tri-axial heavy-duty truck is built, and the nonlinearityof suspension dampers and tires is also considered. With the trajectory of full vehicle gravity center, longitudinaltire force of front wheel, longitudinal acceleration, lateral acceleration, yaw rate and pitch angle as the evaluation indexesof brake property, the influences of system parameters including wheelbase, load shift, road surface roughness andseparated road friction coefficient on brake efficiency, stability and ride comfort are analyzed. In addition, the interactionof brake and full vehicle dynamics is studied. Results show that small wheelbase and load shift may improve the brakeefficiency of vehicles, small road surface roughness is beneficial to brake stability and ride comfort, and great frictionalcoefficient difference of separation road will worsen the brake efficiency and stability.