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Renault believes that the behavior of the vehicle must always be consistent with the instantaneous orders given by the driver, whether braking, accelerating or lifting the foot off the accelerator. The vehicle must also inform its driver when it is near a point of limit. The first part of this paper details the vehicle with respect to its trajectory at stabilized speeds. The rigidity of the overall drift of the axle assemblies and tires, the steering angles induced by vehicle roll attitude, under- and over-steering behavior and vehicle roll attitude, under- and over-steering behavior and behavior of the tire under load are covered. A vehicle trajectory model is used to confirm test results.

Impact noise, inside a car, due to tire-launched gravel on the road can lead to loss of quality perception. Gravel noise is mainly caused by small-sized particles which are too small to be seen on the road by the driver. The investigation focuses on the identification of the mechanisms of excitation and transfer. The spatial distribution of the particles flying from a tire is determined, as well as the probable impact locations on the vehicle body-panels. Finally the relative noise contributions of the body-panels are estimated by adding the panel-to-ear transfer functions. This form of Transfer-Path-Analysis allows vehicle optimization and target setting on the level of the tires, exterior panel treatment and isolation.

By the action on the steering wheel, the driver has the capability to control the trajectory of its vehicle. Nevertheless, the steering wheel has also the role of information provider to the driver. In particular, the torque level at the steering wheel informs the driver about the interaction between the vehicle and the road. This information flow is natural due to the mechanical chain between the road and the steering wheel. Many studies have shown that steering wheel torque feedback is crucial to ensure the control of the vehicle. In the context of uncoupled steering (steer-by-wire vehicle or driving simulators), the torque rendering on the steering wheel is a major challenge. In addition, of the trajectory control, the quality of this torque is a key for the immersion of drivers in virtual environment such as in driving simulators. The torque-rendering loop is composed of different steps.