Electronically controlled continuously variable transmission

Electro-mechanical fluid pressure control means comprising:

• a first chamber having a first fluid passageway for fluid communication therewith;
• a first valve body axially movable within said first chamber;
• moving means for moving said first valve body, comprising a fluid pressure control means having a second chamber, a second valve body axially movable within said second chamber, a second fluid passageway communicating with said second chamber for permitting introduction of fluid therein from a fluid source, another second passageway communicating with said second chamber for permitting fluid to exit therefrom, a coil and a movable core connected to said second valve body, wherein the position of said second valve body is changed by applying current to said coil to control fluid pressure in said another second passageway;
• and
• standby means operatively connected between said another second passageway and said first passageway for controlling fluid pressure in said first chamber in the event of a power failure to either retain said fluid pressure in said first chamber and gradually decrease output pressure or provide an open communication between said first passageway and said fluid source
• said standby means comprising a standby valve for retaining fluid pressure in said first chamber and permitting the pressure therein to decrease gradually in the event of a power failure.

Electro-mechanical fluid pressure control means comprising:

• a first chamber having a first fluid passageway for fluid communication therewith;
• a first valve body axially movable within said first chamber;
• moving means for moving said first valve body, comprising a fluid pressure control means having a second chamber, a second valve body axially movable within said second chamber, a second fluid passageway communicating with said second chamber for permitting introduction of fluid therein from a fluid source, another second passageway communicating with said second chamber for permitting fluid to exit therefrom, a coil and a movable core connected to said second valve body, wherein the position of said second valve body is changed by applying current to said coil to control fluid pressure in said another second passageway;
• and
• standby means operatively connected between said another second passageway and said first passageway for controlling fluid pressure in said first chamber in the event of a power failure to either retain said fluid pressure in said first chamber and gradually decrease output pressure or provide an open communication between said first passageway and said fluid source
• said standby means comprising a standby valve for completely bypassing said second chamber to permit maximum fluid communication between said first chamber and said fluid source.