This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Vehicle Performance Simulation and Optimization Including Tire Slip
Annotation ability available
Sector:
Language:
English
Abstract
A dynamic simulation has been developed to predict the acceleration of a manual-transmission vehicle at wide-open throttle. A notable feature of the model is that tire slip is included, and the coefficient of friction varies with slip. This allows the simulation to start from zero vehicle speed and include the dynamics of gear shifting. The model was used in optimization studies for 3-speed, 4-speed, and 5-speed transmissions which indicated that fastest times, for the vehicle studied, are obtained when the mass center is as close to the drive axle as possible, and gear ratios are selected so that the engine speed brackets the horsepower peak. Also, optimal gear ratios deviate slightly from a geometric progression by closer spacing in higher gears and wider spacing in low gears, a common practice in gear box design.
Recommended Content
Authors
Citation
Starkey, J., Gray, S., and Watts, D., "Vehicle Performance Simulation and Optimization Including Tire Slip," SAE Technical Paper 881733, 1988, https://doi.org/10.4271/881733.Also In
References
- Ordorica, MA. “Vehicle Performance Prediction,” SAE Transactions 74 1966
- Setz, H.L. “Computer Predicts Car Acceleration,” SAE Transactions 68 1961
- Walters, W. C. “General Purpose Automotive Vehicle Performance and Economy Simulator,” SAE Transactions 81 1972
- Wong, J.Y. Theory of Ground Vehicles, John Wiley and Sons 1978
- Rao, S. S. Optimization Theory and Applications