I don't know if there are any techniques, specifically, but slowly incrementing your speed tends to work. Once you can hold a steady rhythm at one speed, pick it up another few bpm and try and maintain a steady rhythm at that speed. As you do it more often, the easier it will be to maintain (and reach) a faster speed.

That's all I could really suggest. I didn't really ever learn any techniques, I just got faster as I got better.