Restore the Control file from the latest backup using BRRESTORE command
Then u will have to run command at SQL
RECOVER using backup controlfile
It will ask redo log files, then u will have to apply all redo log files.
Apply all redo log files and open database using reset logs
During backup it creates a trace file in the oracle/sid/saptrace folder
Because while doing backup it runs command
Backup control file to trace
From that trace file u can get the script to crate control file and then after creating the control file u can proceed with recovery steps as above.