The tyre as link between road and vehicle is one of the key elements in the field of vehicle dynamics concerning safety, driving performance and driving comfort. To simulate the transmitted forces and torques in the contact patch of the tyre, vehicle dynamic models are coupled with handling tyre models. The data to parameterise tyre models is mainly identified by tests at the tyre test rig. These tests are accurate and reproducible measurements, as generally known, but correspond only rarely to real tyreroad contacts. It must be clear to the user of tyre models that these measurement data are subject to systemic significant scatter. Studies have shown that measurements of the cornering stiffness on various tyre test rigs can differ up to 20%. Significant factors for these differences are the coefficient of friction, the geometry of the treadmill or drum or the high tread wear and thermal load. Therefore an adaptation of the tyre parameters is necessary such that the vehicle dynamic simulation correlates to the real driving behaviour. Because of this insufficiencies regarding measurements on the tyre test rig and the parameterisation of the MF-Tyre model itself a new method was developed. This method enables the adjustment of the MF-Tyre model parameters to real road conditions out of arbitrary longitudinal and lateral vehicle dynamic measurements on a test track. The real driving behaviour of the vehicle is determined by vehicle dynamic measurements. With the aid of a driving state controller the manoeuvres from the test track were simulated. Due to an inadequate tyre model parameterisation for the time being, the simulated driving behaviour differs from the measured driving behaviour. The deviance of the simulation is assessed by quality functions including driving state variables. Within a sequential optimisation process the parameters of the MF-Tyre model were automatically adapted so that the differences between real and simulated driving behaviour is minimised. The results are tyre model parameters representing the tyre characteristics at respective road conditions, e.g. concrete or asphalt road, icy or snowy road surface et al. This method replaces the necessity of the elaborate manual modification of the MF-Tyre model parameters. Beyond this, basic tyre properties can be identified without the need of tyre tests at the test rig.
Simulation-based method to adapt MF-Tire model parameters to real road conditions
2014
20 Seiten, Bilder, 6 Quellen
Conference paper
English
Simulation-based method to adapt MF-tire model parameters to real road conditions
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