TIRE SIZE AND INFLATION PRESSURE INFLUENCE ON STATIC STEERING EFFORT General Motors do Brasil Ltda

Format:

Conference/Event

Author/Creator:

Vilela, Vilela, author.

Contributor:

Anderson, Gustavo Rondinelli

Luzetti, Edson Gustavo

Conference Name:

SAE Brasil 2010 Congress and Exhibit (2010-10-05 : Sao Paulo, Brazil)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2010

Summary:

The required hand wheel effort the driver inputs into thesteering wheel during parking maneuvers is an important designfactor for a vehicle, that has a strong influence on thecustomer's overall perception of steering performance. Duringthe development of a new vehicle, the designer is faced by thechallenge of achieving the desired level of steering effort withoutjeopardizing other handling characteristics, like steeringsensitivity and on-center performance. The suspension and steeringtuning to achieve the adequate trade-off between these differentmetrics is especially critical for manual steering systems, whichis a very common configuration for emerging market vehicles. Inaddition, due to communization of architectures, it is common thata vehicle with a manual steering system must share commonsuspension components and geometric parameters with configurationsthat have power steering assistance, making this trade-off evenmore difficult.The objective of this work is to evaluate the influence of tiresize and inflation pressure on static steering effort. This wasquantified by objective measurements of steering wheel torque forparking maneuvers over a surface with controlled frictioncoefficient, changing only the tire parameters. The interaction ofthese parameters with other handling metrics is a natural sequenceof this work, however is not being evaluated here due time andresource restrictions. In the sequence of the physicalmeasurements, the results obtained have been compared againstanalytical predictions of the static steering effort, where thetire scrub torque has been calculated using finite element modelsthat consider all relevant parameters of the tires physicallyevaluated including the non-linear effects. The results of thisstudy allowed the understanding of the tire parameters thataffected the most the static steering effort within the studiedrange. Finally, the correlation of the analytical simulationresults with the physical measurements makes it possible for boththe vehicle and the tire development teams to design and specifytires that can help meeting specific static steering effort targetsearly in the development cycle, taking advantage of reduced timeand costs associated with the usage of early virtualassessments

Notes:

Vendor supplied data

Publisher Number:

2010-36-0105

Access Restriction:

Restricted for use by site license