Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Patent
1996-04-04
1998-08-25
Wright, Dirk
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid controlled mechanical clutch or brake
477117, F16H 128
Patent
active
057978212
ABSTRACT:
An automatic transmission includes a frictionally engaging element for establishing a predetermined speed range. This predetermined speed range may be a second or higher speed range, and it is set temporarily in N-D squat control and also used for establishing a reverse range. In this transmission, engagement-actuation control of the frictionally engaging element for establishing the predetermined speed range which is executed when a shift is made from a N range to a R range comprises a plurality of control stages. When a shift to the R range is made via the N range following a N-D shift, a shift control apparatus detects the engagement condition of the the frictionally engaging element for establishing the predetermined speed range, selects one of the control stages in correspondence with the engagement condition, and initiates the engagement-actuation control of the frictionally engaging element from the control stage selected, so as to execute an engagement control for establishing the reverse range. Thus, in-gear shifts are executed smoothly without any delay in a N-D-N-R range shift.
REFERENCES:
patent: 5301572 (1994-04-01), Tanaka et al.
patent: 5351577 (1994-10-01), Ando et al.
patent: 5537886 (1996-07-01), Toyama
patent: 5655993 (1997-08-01), Fujimoto et al.
patent: 5679095 (1997-10-01), Sekine et al.
European Search Report Communication (Feb. 3, 1998).
Fujimoto Shuichi
Kunii Hisashi
Sato Kazumi
Shimada Takamichi
Ura Yoshiyuki
Honda Giken Kogyo Kabushiki Kaisha
Wright Dirk
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