An electrically variable transmission has a pair of clutches and a first mode when the first clutch is applied and the second clutch released, a second mode when the second clutch is applied and the first clutch released, and a fixed-ratio mode when both clutches are applied. Upshifts and downshifts...http://www.google.fr/patents/US7010406?utm_source=gb-gplus-shareBrevet US7010406 - Shift inhibit control for multi-mode hybrid drive
