Four-stroke rotary- piston engine with adjustable compression ratio and adjustable valve control times

Hybrid drive system for a motor vehicle, and method of operating a motor vehicle

Systems and methods for purge and PCV control

Cam engine

Internal combustion engine and compressor or pump with rotor and piston construction, and electrical generator pneumatically driven by same

Counterpoise engine

Pressure engine, in particular, an internal combustion engine, with an annular structure

Rotary Piston Machine Comprising Two Piston Mounts Arranged on an Axle

Rotary radial internal combustion piston engine

ROTARY ENGINE USING TRADITIONAL PISTONS OF FLEXIBLE MOTION

Rotary fluid motor