This paper describes an experimental vehicle design by the GM Research Laboratories to explore the use of a low-emission engine and electric drive system in a small car. For this study, a 1968 Opel Kadett has been modified to use a variable-speed ac electric motor to drive the rear wheels through reduction gears and the differential. Batteries provide electric power to the motor through electronic circuitry that gives the variable frequency required for speed control. A small Stirling engine, driving an alternator, supplies energy to the batteries.
