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Existing stop-start systems have several concerns such as take-off response, engine restart noise, high cost and system complexity. This paper describes a newly developed stop-start system that overcomes these concerns and can be used on high-volume production models at an affordable cost. The new system is based on a compact motor generator that allows cranking at restart and also functions as an alternator following engine start. A belt-driven system is used for restarting the engine to avoid noise from gear insertion and engagement. The motor generator is capable of high-speed operation for reducing engine startup time. Starting control has also been improved to achieve the shortest possible startup time in combination with a newly developed direct injection engine. Shortening the startup time tends to impair engine smoothness at restart. However, this concern has been resolved through cooperative control with the motor generator.