Controlling the valves electronically can eliminate the need for the camshaft. The camshaft depends on cams for motion and the engine performance can only be set in the 40 to 50 miles an hour range. The system uses a computer to direct the electromagnetic engine valves and varies the amount of air pushed through the engine. A controller determines the fuel usage and the technique to maximum horsepower. Inc. has designed and developed a three-stage cryocooler.
Incoming gas is cooled regeneratively mainly in the first two stages.
A displacer and the cylinder walls act as the regenerator. Gas flowing into the third stage is cooled by a counter flow heat exchanger. Cooling is achieved by a three-stage expansion engine with a single displacer and liquid helium produced by expansion in the third stage. The system consists of a compact cold head operating with a single helium flow circuit and compressor. References Personal letter, November 19, 1994.