Control apparatus for hydraulically operated vehicular transmiss

Details Control apparatus for hydraulically operated vehicular transmiss Control apparatus for hydraulically operated vehicular transmiss

1997-09-23

1999-03-30

Wright, Dirk

Machine element or mechanism

Gearing

Interchangeably locked

477116, F16H 6100

Patent

active

058874836

ABSTRACT:
When switching to a forward running is made while a vehicle is running in a reverse direction, a switching to the forward running condition is made at an early time to thereby prevent the deterioration of the durability of the hydraulic engaging element due to slipping. For that purpose, when a vehicle speed (V) has exceeded a predetermined value (YVa) in a reverse range (R) and also when the vehicle speed (V) has never fallen below the predetermined value (YVa) in a neutral range (N), a reverse signal (FREV=1) is outputted. If FREV=1 at the time of switching to the forward range, the relationship between the vehicle speed and the speed stage (speed change map) is set to one (a reverse-running-measure speed change map) which is different from that at an ordinary time, to thereby determine the speed stage to be established. Then, a low speed stage is established even at a relatively high vehicle speed. Switching is thus made at an early time to the forward running condition with a large torque to be transmitted via the low speed stage.

REFERENCES:
patent: 4316395 (1982-02-01), Brown
patent: 4608873 (1986-09-01), Redzinski
patent: 5353662 (1994-10-01), Vaughters
patent: 5792023 (1998-08-01), Bazzi et al.

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