Abstract: An energy-conserving control system for an electrically driven vehicle comprises a traction motor (3) converting electricity generated by a first generator (1) into mechanical propulsion, and combined with a second generator into a single induction motor/generator (3) operative during deceleration to convert vehicle kinetic energy into electricity; a second motor (2) to convert electricity into mechanical energy stored in a flywheel, and a third generator operative during subsequent acceleration to convert energy stored in a flywheel into electricity to drive the traction motor (3). The second motor and the third generator are also combined as a single induction motor/generator (2). The respective functions of the various motors and generators during acceleration and deceleration are largely determined by variations in the direction and magnitude of the currents applied to their energizing or field windings.

Abstract: The invention concerns an internal combustion engine having an annular cylinder and two co-axial rotors each carrying three or more equi-spaced pistons disposed in the cylinder, the rotors being constrained to undergo cyclic counterphased variations in speed such that the pistons of the two rotors alternately approach and recede from each other and the expansion, exhaust, induction and compression phases of a combustion cycle can be carried out between the pistons making use of inlet exhaust and ignition means provided, there being provision for charge-transfer phase(s) in the combustion cycle between induction of a charge and its compression, each charge transfer past a given piston being effected through a transfer port by a following piston and the number of charge transfer phases in each combustion cycle being equal to the number by which the number of pistons on each rotor exceeds two.