Not a comedy double-act, Atkinson and Miller were engineers, one British and one from the US who each invented methods for improving internal combustion engines. Both types were pretty much forgotten until recently when variable valve timing and electronics have made it possible to emulate the operating principle either style of engine in a conventional design. In fact it’s possible to have the same engine operate in conventional (Otto or Diesel) mode then switch to Atkinson or Miller operation to suit the conditions and load.
I’ve written a couple of pieces for Diesel Car, one on the history one on the modern interpretation of Atkinson and Miller’s designs. So if you ever wondered what Toyota are on about when they praise the simulated Atkinson engine used in the Prius, now’s your chance to find out.