I understand that you are trying to analyze why the selection mode circuit isn't functioning properly. As per the specified input ranges the outport signals would evaluate to:
- Buck Signal: Buck Mode evaluates
. This inequality always evaluates to false since max value of 
(0.4) is less than minimum value of 
(1.6). Hence Buck Signal is always 0. - Boost Signal: Boost evaluates
. This inequality always evaluates to false since max value of 
(1.2) is less than minimum value of 
(2.4). Hence Boost Signal is always 0. - Boost Signal1: Boost1 evaluates
. This inequality always evaluates to true since 
is true. Hence Boost Signal1 is always 10. - Stabilized: The AND condition evaluates
. From above stated inequalities, we have established that BuckBoost is always true, BuckBoost1 is always true and BuckBoost2 is always false. Hence Stabilized is always 0.
I hope this helps!
