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Tire Induced Steering Pull
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English
Abstract
A theory of vehicle steering pull, created by asymmetrical tire cornering properties, is developed. It is validated with free control data obtained on the road.
The effects of tire lateral force and aligning torque asymmetries on a car's straight line stability are analyzed for both fixed and free control. Equations for front axle lateral force, steering system moment, and sideslip angle are derived. They are based on tire properties and certain assumptions about the car's characteristics.
This theory is validated using data obtained in open road testing. The test techniques, as well as alternate ones, are described. In addition, the relationships between actual front axle force and axle conicity force, ply steer force, and lateral force offset are analyzed. It is found that front axle conicity force correlates very strongly with a more accurate theoretical prediction. The axle force predicted by tire conicity force is somewhat low.
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Authors
Topic
Citation
Topping, R., "Tire Induced Steering Pull," SAE Technical Paper 750406, 1975, https://doi.org/10.4271/750406.Also In
References
- SAE Standard Vehicle Dynamics Terminology-SAE J670C, SAE Handbook Supplement
- Ginn J. L. Miller R. F. Marlowe R. L. Heimovics J. F. “The B.F. Goodrich Tire Dynamics Machine.” Paper 490B SAE National Automobile Meeting Detroit March 1962
- Nordeen D. L. “Tire Properties Affecting Ride and Handling.” SAE Transactions 77 1968 paper 680409
- Bundorf R. T. “A Primer on Vehicle Directional Control.” General Motors Engineering Publication A-2730 1968
- Lindenmuth B. E. “Tire Conicity and Ply Steer Effects on Vehicle Performance.” Paper 740074 SAE Automotive Engineering Congress Detroit February 1974