Patent ID: 9097345
Filing Date: 2015-08-04
Classification: B60W,F16H

Abstract:
1. An automatic transmission for a vehicle drivetrain comprising: a transmission housing; an input shaft; an output shaft; a plurality of gears within the transmission housing, the plurality of gears defining multiple mechanical gear ratios between the input shaft and the output shaft; a plurality of clutches operable to selectively engage the plurality of gears to establish the multiple mechanical gear ratios; a plurality of rotational speed sensors, each rotational speed sensor being operable to measure rotational speeds relative to the transmission housing for of one of the plurality of gears; a transmission control system configured to receive signals representing the measured rotational speeds from the plurality of rotational speed sensors and control the plurality of clutches to change between gear ratios of the multiple mechanical gear ratios based at least in part on the signals representing the measured rotational speeds; one or more hydraulic solenoids configured to activate and deactivate the plurality of hydraulically-actuated clutches according to electrical signals; and one or more electronic solenoid drivers configured to receive control signals from the transmission control system and deliver the electrical signals to the one or more hydraulic solenoids based on the control signals from the transmission control system.