With just a year it will be pretty hard to find him.
I hope you are aware that the name "Charles Lennet Lovell" is an anglicized version of whatever he was called in Sweden.
Charles is in all likelihood Carl or Karl.
Lennet could be Leonard (with spelling variants) or Lennart.
The family of Sven Lovell were Löfvell in Sweden, but there are other possibilities, like Löfvall.
There is also a strong possibility that he only picked a surname when he went abroad - a lot of people who had only been using a patronymic as last name in Sweden did that in those times.
As for a child of a Löfvell born out of wedlock: yesterday, using the search functions in ArkivDigital (excellent Swedish paysite) I found a Carl Leonard born in Karlshamn in 1824. He became a sailor and used his mother's surname Brant. Unfortunately this Carl Leonard died in 1853.