Hernandez scored 20 Championship goals for Hull during the 2015-16 season, and has managed three goals in two appearances for Leonid Slutsky's team at the start of the new campaign.
The Uruguay international has found it difficult in the Premier League, but he is confident of making his mark in the second tier of English football once again.
"I'm out to score more than I did last time we played in this division. That was a very good season for me - my best in English football so far - but I want to do even better this time," Hernandez told reporters.
"It would be great to beat that total, and that's my aim. But my main focus is to improve here at Hull and help us achieve our targets this season. That is why I am working hard not only to achieve my own personal goals, but also for the team as well. We all want to enjoy a successful season."
Hernandez, 27, scored a hat-trick in Hull's 4-1 win over Burton Albion at the weekend.