Your sentence seems to have two separate ideas: (1.) A car would run an solve critical mazes (2.) Using infrared sensors and ultrasonic sounds were beyond my knowledge.
Are these ideas connected? Are they separate? Right now it's not clear what you mean, so your sentence is a little nonsensical. Unfortunately a comma won't help that.
Are you saying that you want to use a car to solve the critical mazes because using sensors and sounds are beyond your knowledge? If so, you should add a conjunction (like "because") to indicate the connection to your reader.
Are the ideas totally separate? Then they should be two separate sentences.
If you clarify the meaning more then I can give you better advice.
Hope this helps!