Patent ID: 8021257

Claim:
A transmission comprising: an input member; an output member; at least one motor/generator; first, second, third, and fourth clutches being engageable in response to fluid pressure, said clutches being engageable in various combinations to provide at least one electrically variable mode of operation in which the speed ratio between the input member and the output member is dependent upon the speed of said at least one motor/generator and at least one fixed ratio mode of operation in which the speed ratio between the input member and the output member is fixed; a main passage, a first passage, and a second passage; a pump configured to supply fluid pressure to the main passage; a first valve configured to control fluid communication between the first clutch and the first passage; a second valve configured to control fluid communication between the second clutch and the second passage; a third valve configured to control fluid communication to the third clutch; a fourth valve configured to control fluid communication between the fourth clutch and the main passage; a fifth valve configured to control fluid communication between the main passage and the first passage; and a sixth valve configured to control fluid communication between the main passage and the second passage.