You can change to
jQuery(document).ready(function($) {
$('#bannergroup-<?php echo $module->id; ?>').carousel({
<?php if (strpos( $params->get ('moduleclass_sfx'), 'interval')!==false){
$class_sfx = explode(' ', $params->get ('moduleclass_sfx'));
foreach ($class_sfx as $clsSfx){
if (strpos( $clsSfx, 'interval')!==false){
$interval = str_replace('interval', '', $clsSfx);
}
} ?>
interval: <?php echo $interval; ?>
<?php } ?>
});
});
And config module: 'Advanced Options' -> 'Module Class Suffix' : ' slide autofit autoplay
interval2000'