You can enable autobackup from RMAN command line to automatically backup the control file in every backup job operation.
Enter the following commands/parameters at the RMAN prompt (the catalog connect string is optional):
$rman target <connect string for target> catalog <connect string for catalog>RMAN>configure controlfile autobackup on;
For Example:$rman target systemuser/systempass@rman92 RMAN>configure controlfile autobackup on;