Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Single impeller-turbine type fluid circuit divides or...
Patent
1990-04-30
1991-09-03
Wright, Dirk
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Single impeller-turbine type fluid circuit divides or...
475 49, 475210, 192331, F16H 4708
Patent
active
050450352
ABSTRACT:
A powertrain for passenger cars includes a high specific output engine coupled to an automatic transmission which is expanded from four to five forward speed ratios by a novel two-speed torque converter assembly within the transmission. Both of hydrodynamic action and an integral planetary gearset contribute to torque multiplication provided by the high-stall-speed torque converter when it is in its lower speed ratio, and engagement of a lockup clutch simultaneously deactivates both sources of torque multiplication to thereby establish a 100% efficient one-to-one speed ratio across the converter. Also included in the powertrain in a control system which secures high transmission efficiency early during vehicle acceleration by employing lockup of the torque converter as the first of the four upshifts for the five-speed transmission. Another control system utilizes a drive-by-wire type of engine throttle valve to implement an aggressive gearshift schedule and to limit engine intake air flow under stall conditions of the torque converter. These powertrain features exploit the fuel economy potential of modern high specific output engines and more effectively manage the characteristically peaky torque curve of such engines.
REFERENCES:
patent: 3090255 (1963-05-01), Smirl et al.
patent: 3473411 (1969-10-01), Paredes
patent: 4377226 (1983-03-01), Chevalier et al.
patent: 4946429 (1990-08-01), Sherman
patent: 4964318 (1990-10-01), Ganoung
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